The new damage models will probably first appear for WW2 aircraft. Then the new damage model will continue to be integrated one by one, I guess, into the sim for each unit.
However don't expect these to come with 2.5, there has been no specific date on when these new damage models might be available for us.
For an official update on the state of the damage model view this thread:
https://forums.eagle.ru/showthread.php?t=194540