Hi there. Didn't see this thread until now. We've been reporting our kills in the worldwide thread:
We've downed 16m NiM ZnT, Tanks, and Vorgath. You can find the orginal posts, screen captures, and times here. We also defeated 4 stack Dreadtooth on the first day the servers came up from the patch.
Based on what we've seen between our 8m and 16m raiding teams, there is a definite jump in difficulty from 8m to 16m (which is also evidenced by the fact that nobody has actually reported a 16m kill on Kephess yet... worldwide). Good luck to all guilds working on new progression content!