In terms of hype, it's really a lot more efficient to go in streaks. You sometimes reveal a lot quickly, and then you have droughts. Sakurai is showing this technique well, and he's optimising further with the total unpredictability of the whole thing. As has been said, it's a very long reveal cycle.
When you consider the overall Wii U strategy from Nintendo, emphasizing smash now doesn't make a lot of sense with the next big game being Super Mario 3d World (a strong system seller coming soon). If I were in charge of Nintendo marketing, I'd put out a new and good smash trailer sometime between 3d World's launch and the end of the year (along with similar trailers for tropical freeze, MK8, and X). The smartest plan is to push next year's games after you have a launch for all of this year's games so you both get the full launch power for this year's games and make one last argument to buy a Wii U for the holidays. They may do things somewhat differently of course, but I can't be upset over their strategy given that it's more or less exactly what I would do in their shoes.
You also do have to remember to ask what is done and what's not. This is a game in development, and if everything in the game were ready to show, I have no doubt it would come out within the month. When you consider that, it could very well be that most of the content in the game is just not ready enough to show, and what is ready may not be good for them to show for other reasons (like specific characters being held back for reveals at specific times).
All of it together basically means be patient. I will say though that I'm not super bothered by any reveal patterns because at least the pictures give me something to look forward to each day. I'm up at 2 AM every day anyway, and it's a few minutes of entertainment to check the picture. If it's a cool reveal, that's a bonus, but I'm enjoying following the thing regardless of what I get on any given day (even if it's really stupid picture like Pikachu being a growth on Mega Man's back, so far the only picture that didn't show anything new, look cool, or provide humor). In that way, it's really hard for me to relate to people who are super info hungry and get really bothered when they don't see something new fast enough; are you really not enjoying the spectacle of this at all?