According to the fine folks over the the Windows Team Blog, Mango build has been RTM'ed or released to manufacturing. Which means that the new Gen2 WP7 handsets will be able to start testing on this official WP7 release build and get ready to release to market.
This of course also means that the old G1 WP7 will receive this update soon once our Canadian telcos should be getting this build so that they can start testing on their network and the existing handsets.
Can't wait for Mango? At least it's now a matter of Rogers/Telus/Bell/Sasktel getting their act together and start testing this build on their network.