not sure how many people may or may not be aware, but i received a message on my phone today stating that the official OS6 software was available from T-Mobile's website for the 9300. if you haven't gotten the message, you might want to check My.TMobile.com . (it's not an OTA download, it has to be updated via DM).
i'm not sure exactly which version it is, but i'll probably be updating a little bit later and i'll let everyone know if i have any issues.