Got my invite this afternoon, looks like every other time someone tries to "fix" email.
Gmail itself tried to sneak some label/heading/tab things in awhile ago that I promptly turned off. I really don't mean it badly but I don't see a use for this stuff unless one is chronically unorganized. I get 30 emails a day on my personal account and maybe twice that at work. No biggie, read, label, star, archive. Solution looking for a problem imo.
On a related note, I also can't stand Evernote and the like, and even more so with the latest update. I'm forced to use it, although very little, at work. I'm too much of a DOS kid to need this touchy feely crap.