I hope the "Working on more of course, hope to update soon" quote means that they're at least working on something other than "just" online stability and buffs/nerfs. Those are important parts of the game that definitely demands attention, but working on DLC; stuff like characters, stages and costumes, could greatly increase the longevity of the game.
Keeping my fingers crossed thanks to this tweet. A couple of more '2 characters, 1 stage' DLC packs would be awesome, but I'll take anything right now. The game is not dead, not until everyone stops talking about it or playing it (online or offline, doesn't matter), which is apparently not the case. SSM are at least supporting it to some extent, this tweet shows that they're at least working on something. Time will tell what this something is, maybe it's good.