They just put out the new forum avatars for V2. 1024 of them If I recall correctly, multiple versions per flag. (EDIT: 1040 actually.)
Communist Scandinavia
Confederate Monarchy
Fascist China
Australian Republic
You can see them all at this link. Just change the country tag and the government form to check the flags. (republic, communist, fascist, monarchy)
http://forum.paradoxplaza.com/forum/archive/v2avatars/AST_republic.png
EDIT: Furthermore, it appears that the Chinese warlord states are in the game. And Mughalistan, but also Hindustan. And Austria-Hungary will be treated as a seperate nation? But Belarus and Iberia don't appear to be represented. Nor does what appeared to be a German Transylvanian state I thought I saw in a screenshot once.
EDIT 2: Nevermind, there's something in Transylvania. Here's its fascist flag.