I seriously hope you are kidding about Yahoo!
I know everyone is afraid of Yahoo! bloat, but conspiracy theories this quickly...come on...
219 fixes..it's been over 2 months since an update..plenty of time for additions. Check out the product portal, there's a lot of stuff there.
I know it takes time for deals to get inked and many meetings...etc..etc.. But I'm pretty sure, based on what I've read/heard, that the Yahoo! acquisition announcement was a surprise to most employees at Zimbra too. Let's give it a little time....geez.