We won't see any Lucario screens, not until the guide or game release anyway.
We were not meant to know about this. About an hour after the video with thsoe screens in was released, it was pulled offline and edited so that Lucario etc were not visible. Luckily someone picked up on it.
I realize all of that, and am not really expecting anything anytime soon - just anticipating it.
Once the game is released on the 31, I suspect Dojo will start putting up more information about the remaining hidden characters. There'd really be no point for them not to since most everyone online will already know.
As for the final number of hidden characters... 48 is floating around now, but with the current amount of revealed characters and those assumed/leaked, we're still only at 32 (Gannondorf, Capt. Falcon, Jigglypuff, Lucario, Ness, and Mr. Game and Watch). 33 if you add Mewtwo. That's still a fair jump to 48, so I can't say I'm not skeptic...