We've seen the Android Dev Phone 1 for quite some time now and it was essentially a T-Mobile G1/HTC Dream with some snazzy graphics on the battery cover. Now, the Android Dev Phone 2 is essentially the myTouch 3G/HTC Magic/Google Ion with the cute Android Robot peering out on the battery cover.
The Android Dev Phone 2 is available for $399 and comes unlocked for use with any GSM carrier. Developers should note that the ADP2 comes with Android 1.6 and not Android 2.0 which can be qualified as a strange move since Android 2.0 is already live and running. We're not sure if developers will find a reason to switch over to the ADP2 but the ADP2 does offer 512MB ROM vs the 256MB ROM of the ADP1.
In any case, since there's not much difference in the dev phones (and it's a device that's entirely familiar), it's definitely more fun to wonder what the Android Dev Phone 3 will be. Perhaps the Motorola Milestone?