No huge explanation is needed. Bethesda can simply add them and say it is a new option for the player. NPC's usually have reacted to the player based on things like personality and fame/infamy. This has been handled by game mechanics. So no new programming would be required.

Let me deal with this "lore" issue that keeps being brought up. If the only "good" dremora is the player character, then lore is not affected at all. To illustrate: There were 10 playable races and two genders of same in Elder Scrolls IV Oblivion. I finished the main quest with two different races represented. If we add in all players who played the main quest, then it is likely that all 10 races were represented. When the "official lore" of the Oblivion Crisis comes out (probably as in game books in TES V) the Champion of Cyrodill (if same even acknowledged) will either be one race and gender or they could be deliberately vague and give no specific about same. What any individual player does in their game has no effect on the so-called "official lore." Assuming commercial success for TES V and the doing TES VI, when they do the official lore (history) of the "Dovakiin" they either will have to pick one race and gender or be deliberately vague. It doesn't matter what race or type character any player picks to play vis a vis "official lore."

If there were other non-hostile dremora in game besides the player character, then that would need explanation (this could again be handled by an in game book to give the backstory) . These are relatively easy tweaks for a product coming out in a few months.

Here is another thing about Dremora compared to some other proposed races: If dremora are in the game in any form, then the graphics for them is already done. Adding a dremora as a playable option could be as simple as checking a box in the constuction set. Anything that would require major new script writing is proabably too late for them to make their street date in November. If they don't already have the graphics for dremora in game, then it would be too late to add them in (with any scripting) and do testing to make their street date. I have yet to see one objective reason why they should not be made a playable option (if they are already in game in some form).

I'm sure people with make mods to make it possible. It has been like that in the previous two games (because, as you have said, making dremoras playable is really easy, from the Construction Set), but for the original game? No. It would be as logical as letting you play as a Mudcrab.

Mudcrab has only two skills, one pincered and shell, and shell is just heavy armour with less customsation, so is an obvious sign of dumbing down. The playable mudcrab is only possible because of pandering to fps fans.

I have yet to see one objective reason why they should not be made a playable option (if they are already in game in some form).

I think the races are fine as they are, 10 is certainly enough. However, maybe it would be cool to be able to blend races? For example have a half elf, half human character that receives only part of the bonus that each race gets if they were 'pedigree' so to speak.

People say that a new race wouldn't go with the lore, but Bethesda could add a new race if they wanted by just saying they're from an unknown land or the lived underground this whole time and no one knew about them. It's their lore, they can do what they want with it

Playing a dremora would be possible, of course, and basically that's what you are saying. But, once again, if you don't even give a reason of why the PC dremora hasn't any problem with anyone and why he is cool with humans... the character doesn't make any sense. There is no reason to include something like that. Commercial succes? I seriously doubt that more people would buy the game.... just for having the option to play (inoherently) as a dremora.

Adding more non-hostile dremora, turning the race in "friendly" NPCs would be a stinky bad idea. As I have said, most of us prefer them as the badass demons they are now.

I'm sure people with make mods to make it possible. It has been like that in the previous two games (because, as you have said, making dremoras playable is really easy, from the Construction Set), but for the original game? No. It would be as logical as letting you play as a Mudcrab.

It is up to the player to provide the rationale for their characer concept. New player characters have, up until now, been a "clean slate" (i.e., no backstory) . This is fantasy role-playing. The reason to add it would be another option for the players (at little to no additional expense to Bethesda).

No where did I say the race needed to be friendly. Elder Scrolls IV Oblivion worked with something called factions. As with the other in game races, there can be hostile and non-hostile factions. But again, if it is only the player (as a Dremora), this "problem" doesn't even arise. As far as your preference for dremoras as "badass demons," you would be able to play a dremora as a "badass demon." Elder Scrolls is a sandbox franchise and thus allows choices in gaming styles. More choices > less choices.

The problem with it being a mod is that mods have a history of causing conflicts (quests can encounter a problem where they don't advance properly in the stages) and is thus an uncertain "solution" at best. If Bethesda checks that "playable" box in the Construction Set, then there can be no conflict from its inclusion.

As I explained, you need not fear for the "official lore," as it is not determined by how individual players play their game.