Mine downloaded yesterday. It took about 30 minutes to download, install, and update the apps. My Google calendar won't load up this morning. Bummer because our master calandar is sync'd to our pc's and nexus 4's, and N10's. I see the calendar is updated on my pc though. When I try to load it on the N10, the icon shows on the screen and there's 1 dot on the progress bar, but that's it
Lot's of things are quite different in the gmail app, too. I can no longer swipe delete emails from the left column. Now you have to open the email and hit the garbage can icon.
Oops! Apparently you have to watch an update info blurb before the calendar app will open. I just didn't notice the little arrow in the lower right hand corner of the screen.