16197 is said to be final version,it is true that not everyone have it retail yet, infact i haven't seen a retail machine with it yet (by retail in this case i mean a console that is NOT in the beta program)
My console was in the beta program, and i've had 16197 on my computer aswell since a couple of hours after it was released on live... i've noticed that i no longer have the "BETA" tab on my machine when i go online indicating it's gone final, but i haven't been able to verify that there is nothing new in the su yet, maybe there is a special one for retails? i don't know yet, the ones that are published all over the web as final are from what i know beta extracted updates...
I only release 2.085 as an update for those wanting to build 16197 now and have a good tool for it, still working on xeBuild GUI v3, that's why there is no full corona v2 support, to much work to rebuild the functions for that in v2, i have it done in v3 already
Atm there is no need to update past 15574, there is no game that requires higher, and there won't be for another couple of months apart from maybe some xbla/dlc... but seriously... no need to update yet...