This has been one of the primary concerns from many AKL guests about the AKV conversion.
I'm not sure exactly what you booked for concierge level...there have been some "Deluxe Concierge" rooms booked for certain time frames,, and, in that case, little will likely change for you. You'll be in one of the unconverted deluxe rooms (likely on the 5th floor, not 6th) currently left.
If you've booked a STANDARD concierge room, you'll now be on the 4th floor, in a STANDARD sized room (so occupancy of only 4, not 5...you lose the daybed)...the one nice thing about these is that all but a handfull are savannah (with a few former "smoking" standard concierge rooms surrounding the pool) view. You'll still have access to the lounge on 6, but at some point coming up, that lounge will start to be run by DVC, rather than the lodge, itself. From what we've been told, you shouldn't expect much to change in the way of offerings, etc.