Is this a...good update?! They do exist! *glee*
I actually really like the looks of this stage. The platform layout is unique without being too wacky, and the colors and lighting are pretty. As long as the stage flips quickly enough to not completely screw over poor jumpers like Bowser or Captain Falcon (they'd be easy prey for the likes of Meta Knight if they're forced to use their up-Bs early), I don't think it will be too obstructive. The only problem is that between the flipping and the fact that the stage seems to have a hard ceiling half of the time (unless the large platform is just above the kill line), characters with good airtime and heavy resistance to horizontal KOs (Meta Knight, Pit, Peach, and, fittingly enough, probably Samus) might have too big of an advantage.
Also, this might be a coincidence, but the last week of good updates is generally considered to be the week of October 29th (Stage Builder and Summit), a little more than a month before Dec. 3th. We then had a month and a half of filler, and now it's a little more than a month before the Japanese release date in late January. Could it be possible that all the delay filler was concentrated into the past month and what was originally planned to be the final month of good updates has now resumed? Maybe I'm getting ahead of myself and we just happened to be lucky today, but it's a little bit of hope, at least.