Hmmm. I am personally betting that they won't take out anyone who was in the first two games with the possible exception of Ness, considering they did a pretty good job of replacing him with Lucas. The pictures linked to on that thread are unreliable at best, and although it would be cool if lucario is a playable character, I personally don't trust most of the rumors on gamefaqs unless I can verify them with another, more reliable source.
Since Sakurai (hopefully) does not want to end up with the whole cloned characters issue that Melee suffered from, I imagine that they will choose a more diverse cast of characters (especially since they are including third party characters), and while, again, hopefully not leaving out anyone, the ones who were clones will probably get a move make over if they are going to be in Brawl. If Sakurai keeps the clones then he is stupider than I thought.
Also, if Mr.Game and Watch doesn't make the cut, heads will roll.