three things
1. for those of you who are saying that Mario would have too many stages if 1-2 more were added, in case you didn't notice, Mario is sort of an important and HUGE franchise. emphasis on HUGE. 7 or 8 stages isn't that many if you put it in perspective, plus, Yoshi stages do not count as Mario stages. They are YOSHI stages.
2. I'm not too convinced that all of the stages have been unlocked.
3. (reason for number 2^^) Kirby has no stages outside of Halberd (and green greens, though that is the worst possible Kirby stage to bring back) which really isn't a Kirby stage, though it does come from the Kirby games. There has to be AT LEAST one more from that franchise, especially since Sakurai is the developer of Kirby as well.
@ freeman123:
yes we are sure, in one video, the person selecting the stage goes into the Melee stages screen and there are pics of them. here's the vid
http://www.youtube.com/watch?v=0ptrXJi1gdw
it's right towards the beginning and you'll have to pause it to see them.