One of the wildest new additions in the latest Smash is 8-Player Smash, but the mode is so hectic that only a few stages are deemed large enough to contain all the action. In a new update released today, 15 previously inaccessible stages can now be selected in 8-Player Smash.
There are 9 stages pulled from the standard pool and 6 pulled from their Omega (i.e. "Final Destination") variants:
Regular Stages
Mario Circuit (Brawl)
Luigi's Mansion
Pyrosphere
Norfair
Lylat Cruise
Pokemon Stadium 2
Town and City
Smashville
Wii Fit StudioOmega Stages
Mario Galaxy
Mario Circuit (Brawl)
The Great Cave Offensive
Lylat Cruise
Pokemon Stadium 2
Town and City
Nintendo mentions that there are other fixes in the update, although as is usually the case, it has failed to detail what those other changes are. I'm sure inquisitive fans will discover the nature of those changes soon enough.