As demonstrated by Traveller's Tales, there's a large market for anything LEGO.
http://en.wikipedia.org/wiki/Lego_Star_Wars:_The_Video_Game
http://en.wikipedia.org/wiki/Lego_Star_Wars_II:_The_Original_Trilogy
http://en.wikipedia.org/wiki/Lego_Indiana_Jones:_The_Original_Adventures
http://en.wikipedia.org/wiki/Lego_Indiana_Jones_2:_The_Adventure_Continues
http://en.wikipedia.org/wiki/Lego_Batman:_The_Videogame
http://en.wikipedia.org/wiki/Lego_Rock_Band
Elder Scrolls Lego
We're so avant garde we place Lego at the end
Rather than making the content episodic, as featured in every Lego game mentioned (to my knowledge), the playground will be open world, in true Elder Scrolls style, with unlockable areas.
Since we wouldn't want to overwhelm the poor players, a loose story would direct the game's flow; much like in the past Elder Scrolls.
With Lego being Lego, character creation can stay, without sacrificing story. Using a list of facial features, hairstyles and articles of clothing, one could create their very own minifigure, choosing one of 10 races, none of which better than another. Because WHO wouldn't want to see a Lego Argonian?
This isn't to say skills, stats and numbers would be ditched entirely. Just simplified, for the sake of giggles.
Skills
Fighting: Encompasses all melee combat. In order to avoid "chances to hit" and what not, a higher Attack skill will widen the player's potential arsenal, with better weapons doing more damage, striking faster or having some sort of special effect.
Magic: Encompasses all schools of magic, with the exception of Alchemy. A higher Magic skill will allow the player to use more powerful spells.
Agility: Encompasses skills typically attributed to Thieves. A higher Agility skill will allow the player to perform dangerous leaps, run faster, do special moves (combat or otherwise) and widen the player's other potential arsenal, governing the use of ranged weapons (such as bows, crossbows, throwing knives...) and a specific line of close quarter weapons. Daggers and other arms stereotypically associated to people of a stealthier persuasion.
Talk: Makes the persusasion minigame* easier, by giving the player more time to react. Also makes prices in shops lower, with the given price higher. Unlocks certain options. Such as a way into a city (at night), valuable information not disclosed otherwise and... something else.
*: I'll mention in the section below
MINIGAMES!!1
A variety of MINIGAMES!!1 will be featured.
Here are a few examples.
Store!!1: The player has to serve customers their "orders" in specific... orders... (Light Blue Cape/White Sword/Orcish Armor, for example) With a time limit, of course.
Races!!1: The player can choose to partake in horse (or whatever animal is appropriate) races.
Persusasion Minigame!!1: Similar to the Guitar Hero formula, the player will have to press keys as they flash, with special combos possible.
A brief thought on Alchemy
Purchased potions change speed, jumping, fighting, magic...
There's a special "potion maker" unlocked after completing "X" objective.
The economy would be composed of Studs. Obtaining Studs also unlocks things. Dying removes studs. But you should be familiar with that, having played every Lego game in existence.
Memory Games with no determined purpose!!1
Lego Argonians! What's there not to love?
~PorridgeIsGood