When that new World of Warplanes came out and we had a rash of departures the primary response was the incredible graphics. It was like looking at a color picture. Flies a bit arcadish but that was the big complaint.
My guess is HiTech will do this upgrade, then spend some time making sure the planes fit the new graphics. Once the look is more modern, we'll see some new planes.
Just my guess.
boo