Yes. The Yahoo! Mail app is forcing me to upgrade to v1.2 through a download outside the market. The app will not work without upgrading and the upgrade is not appearing in the market. I downloaded and installed the upgrade through the web browser, and received persistent FC errors when attempting to access the general settings. I uninstalled until they get their act together.
I just installed (Epic 4G) about 30 minutes ago after doing a little research on what the heck I was potentially downloading... it seems all is well and it's a legitimate update from Yahoo, though the method of delivery (not through the market?) is a little questionable... it has a **sort of** new look u/i with some slight new features and the ability to add multiple yahoo accounts. I'm still looking for a full change-log somewhere but the changes appear to be minor at best