This is a quote from the 4.11 guide:
Fw 190
''For the whole series handling and performance have been changed.
A new model has been made, a fully rated A-4. The derated model is now simulated by using the same engine with a limited throttle. (88 percent)
The A-5 and A-6 no longer have the erhöhte Notleistung. The A-5 1.65ata boost system onlyworks at low altitude now.
The D-9 1944 has been modelled to 1900hp version performance, the D-9 45 remains with the 2150hp MW50 injection performance.
The Ta 152 H-1 now has working GM-1 injection.''
Basically, the whole Fw 190 family has been re-done to match the characteristics of the real thing more precisely, also several mistakes have been fixed as described in the above paragraph. (e.g. versions with WEP)
I agree the information is rather vague but I believe that any 190 jockey will notice and appreciate these changes. This doesn't mean the plane is better now, it simply feels different by a margin. Best thing to do is go and give it a shot and check the loadouts, too.
