Being as Bethesda has released little information to date I don't see how its time to lay back and be satisfied. What if they decided to remove all the factions and only have a main quest? What if it ships without ridable horses? What if the game has a horrendously poorly written ending like Fallout 3 did? Not that any of these (aside from the last one) are particularly likely, but it's better to wait to get more details to be satisfied.
Bethesda's not [censored] enough to cut out the factions -- they've been hinting at the Dark Brotherhood, and lore says there's two different Mage Guilds in Skyrim, during the game's time period. They wouldn't have written that lore if it weren't pertinent. The ending in Fallout was only bad because it was a true end to the game, and should have been more climactic; TES doesn't really have an end. And horses would be nice, but I use fast travel, so meh. :shrug: Like you said, they're not really that likely, and the last one isn't even a big deal to me. They aren't going to cut out the things that made Oblivion and Morrowind such successes.
EDIT: Oh snap, they censored me! I'm such a bad girl. :touched: