@DrNo:
Well, but even Bavarias... special identity is just another statelevel identity, in the end, and not an own national sentiment or anything. Of course they are special in some regards, also politcially. If that would also count for Austria - well, as a thought, it might even be that Austria
deliberatly does not form marks of an own identity like Bavarias. After all, the Anschluss came after deaces of
outside imposed seperation, so a frenzy of making Austria falling as much in line with the rest of Germany as possible could be possible... so no "Austrian CSU-equivalent" maybe.
As for th elanguage, the OTL differences are mainly differences of different
Ausbausprachen. While there is an Austrian dialect (or rather, an Austro-Bavarian dialect), that is not the base for the divergences between High German and "High Austrian", but rather divergent development. I would assume that, while the Austrian dialect remains as much in place as the various other German dialects (meaning not all that much over time...) this falls in line, too, though its also possible Austria remains some divergences the same way as, say, the BR has other pronouncation guildiens as all other German stations... but since Germany is usually big on standardisation I could see the official uses being harmonised, with the divergences becoming just part of local dialect.
Of course, that all is assuming a democratic, non-Nazi Anschluss (and avoidal of WW2, which seems the only way to make it permanent)