What is the changelog for this?
Also, to Brian7, we've always backed up our apps, early releases of MIUI didn't restore market apps at all, that only started happening in the last release or two. It's also not a big deal, use Ti, or Astro, and back your stuff up. Why wouldn't you back up your apps?
As far as the gmail app goes, I had the same problem with updating it when it came out. But its pretty easy to delete the apk from system/app using Root Explorer, download the new one, and push it to system if that's what you want.
Don't get so hot and bothered, it's the internet.