I hate to bear bad news, but I played the demo at the conference, and Ridley is in the background attacking you as a hazard.
joke
hrm... This stage kinda disappoints me. I mean, the one we had in melee was great looking. It had such an organic feel to it, much like the environments of a ton of metroid levels. You could like attack parts of it and it would snap off. I loved that. I guess this one just seems too much like battlefield over lava. I wish we'd get a stage like.. from the inside of the seed or something. I kind of hope the two metroid stages from melee are brought back, I loved them so much. Heck, I hope most stages are brought back.
But as a replacement, this one actually seems not as good as the acid-flowing level from melee.