I see a small change in color to the forum is up. 
Yes, all avast web sites, avast.com and the blog, forum, support are being brought into the same new style.
Hasn’t that image been like that all the time? I didn’t notice that before, what was it like?
The favicon has changed too 
Only the default forum theme will change I believe, as my beloved Babylon theme will remain. So since I don’t use the default theme I won’t see any changes in the Babylon theme. The favicon.ico is somewhat easier than changing the whole default theme though.