do you think we have to wait this long after the trailer to get the game this time?
I doubt it. SSB4 is already close to a year and a half in development and we've already seen a lot more than what we saw with Brawl when it was first revealed. For Brawl, we really didn't get to see any real gameplay footage until the game was about a year in development and even then it was limited compared to what we saw just three weeks ago. Also, Brawl's development was roughly 2 years and that includes the two month delay that happened to deal with complications with the online features. These complications along with the SSE took up the bulk of the development process and with the WiiU having a significantly better online infrastructure than the Wii and multiplayer being more of the focus this time around, I doubt development will go far beyond 2 1/2 years.
With Brawl, Sakurai's original plan seemed to be to reveal characters in the starting roster in the last half year before the game came out. On the Dojo, May saw the reveal of Mario, Link, and Pit, June saw Kirby, Pikachu, Samus, Fox, Wario, and Zelda, July saw Bowser, ZSS, and DK, August saw Yoshi, Ike, Peach, Diddy, and Pokemon Trainer, September saw Metaknight, Ice Climbers, and Snake, October saw Sonic, Lucas, and King Dedede and, because of the delay, Olimar and, finally, Sheik were not revealed until January 2008, about two weeks before the Japanese release. This whole reveal process lasted roughly 7 months although the original course of action appeared to be roughly 5 since the Dojo opened up in late May 2007. Putting this into consideration, I feel that character profiles will start popping up in January at the earliest and March at the latest. Something to consider though is that Nintendo didn't do monthly Nintendo Directs back then and it's clear that this is how Nintendo intends to advertise this game.