So, I logged in to the level 40 FF I rolled up during Beta (my namesake), and played through a couple missions of the new content. I like the little "hospital" area idea, but the mission to "cool off" a few citizens with a can of aerosol freezy-mist had me rolling my eyes. Fine, I played along and cooled off a few toons. I'll admit that it was kind of disturbing to see NPC's screaming and bursting into flames around me while I saved one lucky pixel person. Still, the mission kind of felt contrived and recycled, like the infected wolves in Canada or the infected rats on Monster Island.
I talked to Dr Silverback, (who, along with Microman, has managed to somehow be in both Reniassance Center and the mobile hospital at the same time) then shrunk down to invade the brains of a couple hapless citizens. The new map is icky fun, but unfortunately, the play is no different than any other instance in CO; kill x bad guys and defeat a stronger enemy at the end (and destroy a few objects). Rinse, repeat ...this time with a stronger villain at the end. That's where I logged off.
I am glad that CO is finally doing something to ease the drought of new content, but I don't see this as a "major release" or an expansion. It's just a couple missions and a new map. Hopefully they'll prove me wrong and I'll end up eating my words.