My Garmin 830 got it a couple of weeks ago, but no sign of it yet for my wifes 530.
Should now be available. I spoke with Garmin earlier today and it is now fixed.
It's actually complaining about device storage. There's another thread on this subject and Garmin Support says it is fixed, but it wasn't for me. I decided to delete the map files from the device and am now reinstalling using GE.