The AB6 gifted by LH to LX is also getting the old C seats and will run on flights to Africa. AMM was a 321 destination the last time I checked. Except for DXB, CAI and TLV LH is running a mix of 321 and AB6 anyway to the near/middle east. I guess LH is building the market for a bit more volume to support its weflyhome market in the US.
The OS DXB bird is a special 738NG with C seats.