Really happy to see that Shulk is in, as he'd been on my wanted list since I finished Xenoblade about a year and a half ago. I recently began to think Melia would make for a more interesting fighter, actually, but I'm just glad Xenoblade is getting any representation at all (and Sakurai made it sound like it might not've happened). I also noticed that Dunban and Riki were in a couple of screens as well; does anyone know what the deal with that is? Perhaps Shulk's Final Smash is a chain attack? (Edit: Watching the trailer again, it's obvious the chain attack is a thing. Guess I just missed it the first time.)
Regardless, he's looking very promising. I didn't understand why people kept saying he looked like a Marth clone in the leak, the only similarities I could see were his recovery move and his counter move. Other than that, his move set looked completely original, and we can see from his reveal trailer that it is. The way the Monado Arts were incorporated was brilliant as well. I'm thoroughly impressed by Sakurai's efforts to bring fresh and exciting elements into Smash's relatively simplistic gameplay with these games. While it seems the pace of the games is more in line with Brawl -- as much as I prefer Melee's pace -- it seems there will be plenty of other factors contributing to fun and exciting gameplay.
In light of this information, while I wouldn't say they're 100% confirmed, I'd say there's a 99% likelihood that the leaks were genuine. I'm completely okay with this, because Bowser Jr. looked very intriguing, as did the Duck Hunt dog. The supposed character select screen for the 3DS is admittedly a little ugly, and Ganondorf seems to be a clone again, but neither of these things really bother me. Either way, I'm indifferent to the few things from the leak that are still unconfirmed, so I won't be bothered if the leaks somehow turn out to be false.
What's troubling me now is whether or not to buy the 3DS version right when it comes out or wait for the Wii U version. I'll buy both eventually, but I'd really like to experience the new Smash Bros. for the first time in its full glory on the Wii U (didn't have the chance to do the Best Buy demo during E3). My hype is making it extremely difficult to wait that long, though. (I suppose this is the best possible problem to have, really.)