There weren't any FM changes made to any planes with the release of AH2 as far as HTC has stated.
There was an overall change to FM where HTC modelled a far greater number of points on the wings (if I understood it right) which affects all planes, specially near stall speed and high angles of attack.
No changes were made to the 190's. No changes were made to the 109's. The 109's just gained alot from the new FM redo. (possibly partly to the fact that they have leading edge slats that, before the FM change, didn't work quite as well as they should).
No FM changes are being made to any of the new modells released if I have understood HTC right. These updates are purly "eye candy" with improved 3D modells and skins.
The only FM difference is on the new planes that are added (P47N, 109 G14, Spit XVI etc).
As for the possibility of releasing the 109's prior to the spits, looking at history this won't happen unless something drastic happens to the spitfire remodelling which halts the progress.
And as have been stated before, the spits are more then likely being remade at the same time as the 109's, Superfly is working on them more then likely. Question is who is making the skins?