Honestly, there's 123 updates left in 2013; I will personally give Sakurai a trophy the size of a small child if he's able to stall for that long with the little information he currently has. All the characters and all the stages that were shown at E3 have been shown in at least one daily update.
They haven't shown all of the special moves and attacks of all the characters, so I guess there's that.
But even showing more moves for WFT and Villager, the unseen moves for remaining cast members (e.g. Pikachu's neutral B, Fox's blaster, Final Smashes, taunts, etc.), Smash Ball and any unseen parts of the revealed stages would be stretching it quite a bit. Of course, that would still be preferable to just showing Pikachu's butt or something.
If he doesn't show us any items, Pokeball Pokemon, ATs, new stages, or parts of the story mode, much less any new characters before the end of the year it would be shocking.
I would be surprised if we don't get anything when the Nintendo Directs come out.
And it's fair to be annoyed at him teasing us. I'd rather we get only one picture a week or less than that if it would at least show something we haven't seen every time. Even if it's not amazing information (like, showing new parts of the 3DS Mario stage, the return of some staple items, etc.).
Personally, I feel that a better approach would be to reveal new information on a schedule. Like every Friday, we're guaranteed to get something new revealed (an item, a piece of music, a stage, a special attack, information about modes, or a new character). Builds up anticipation without causing so much disappointment.