I would basically count on it happening at this point. What we know about nerfs thus far indicates that they basically want most characters to have a recovery no greater than Fox's, and Lucario's recovery has so many mixup options and ways of punishing the edgeguarder that it would be a shock if they didn't do something to Lucario's recovery.
That being said, I think the PM Dev Team recognizes that Lucario isn't as great a character as he seems, he just has a lot of glitz and glamour to cover up his pretty shaky neutral game and pretty DI-able combo game. Hopefully he gets something to make up for his recovery being nerfed, but I wouldn't count on anything too drastic.
EDIT - Also, I love how Aura Sphere is currently. Maybe a biiiiit more speed would be nice, and I think the secret final level is unnecessarily hard to attain, but honestly, it's a super underrated move. I've gotten tons of kills off of it, it has great knockback and besides the first level, it has two hits of life, so it's difficult to clank with.