I would ADORE it to come back, as nerfed as possible if they want. If it comes down to post-editing Lucario in the beta/alpha, I am very partial to the Aura mechanic (you don't worry about getting hit as much, gets you a good survival game too, ultrataunt is one of the best moves in the game) and it's charms. Like say, it activates at 1.0 and slowly goes to 1.5-2.0., but you've gotta be a lucky man to get the highest potentials of the aura without the ultrataunt (that could be changed too, to be honest)
It does seem that Lucario acts like a regular character now though, all of his moves have their high percentage magic permanently (close combat is the BEST KO move I know in Brawl Minus, Pursuit is much better then Double Team, but it's low % lag is weird)