Have you been following this thread, we are making announcements whenever we change things:
We made one major update to rankings the day the raid was released – that is what we usually do with patches, because we need to see the final live data then recalculate everything.
We did another update to adjust some corruption effects, and we’ll have to do another one (probably later today or early tomorrow) because blizzard just announced some changes yesterday.
And they just announced more changes today to some Ny’alotha gear, so we’ll be updating again to account for those changes this weekend. I expect them to do another couple small updates, but we’ll see.
So most of our updates are because… the game changed!