When Google released Android 2.2 it didn't really release Android 2.2, but now it has...
In short last week Google made the final build of 2.2 (also known as 'Froyo') available to developers and manufacturers allowing app and handset makers to start getting their respective software and hardware up to date.
The difference is today Google has released Android 2.2 for its Google Nexus One meaning OTA upgrades should start appearing over the next few days. How it will affect other vanilla installs of Android as seen on the Motorola XT720 remains to be seen, but I suspect you'll have to apply it manually.
We've gone over Froyo many times, but the big advantages are huge speed gains of up to 450 per cent compared to 2.1 alongside Flash 10.1 integration and the long awaited ability to install apps onto microSD cards (though apps have to be updated to become compatible with this).
In related news the venerable HTC Hero is finally getting an upgrade to Android 2.1 - yes, just as 2.2 comes out. Don't sweat it too much though as you'll now be on the same level as the newer Legend and Desire. Well at least until they get their impending 2.2 updates...
Yes, let's hope those Google plans to combat fragmentation come to fruition soon...
Update Recombu has spoken to HTC and a spokesperson confirmed: "We are working hard with our partners to update the HTC Sense experience on Froyo and distribute it to our customers as fast as possible. We expect to release updates for several of our 2010 models including Desire, Legend and Wildfire beginning in Q3."
We already knew this was the timeframe, but at least it has been reiterated.
Android 2.2 Developer Site
Hero 2.1 Firmware download