So long as they put in lots of tournament capable stages. So far, the castle seems scripted, which means it could be used for tournies(any static stage, or stage with scripted movements usually has a half decent chance for tourny legal, unless they have a game breaking property, like Hyrule temple).
As for Ike being announced, pretty cool. He's always been a popular lord amoung English and Japanese players alike. I would have liked to see Hector(sure, he was broken, but he was so awsome) or Lyn(Smash needs more female characters...not to mention that Lyn would be pretty cool to use), but Ike's definetly a great choice. I'm still pretty sure that Marth will be in, since he's the first FE lord. It's like taking out Mario, but still having Yoshi in. Only thing I'm dissapointed with is that the models for FE 10 don't look nearly as good as SSBB Ike lol.
I also wonder what they're going to do with Snake.... Here's to hoping he does something absolutely awsome with the box. I'd perfer a Belmont for a smash game, but Snake is awsome already. I just hope they keep him balanced. I'd love to use him as a main(as I've said before, I love you Snake, I really do, but I just won't buy a PS3 for you), but if he's too powerful(as in, not even tourny legal), or too weak(think: Mewtwo), then I won't use him.
And what of Ganny dammit!?!?