RFC6154 and upgrade to Cyrus 2.5

[Marco]

Hello,

  on Cyrus 2.4 I see extenstion for xlist folder flags. Folders and  
flags must be configured on imapd.conf. Great, it works! Flags are  
magically applied to all folders!

If I upgrade to Cyrus 2.5 or upper, what does it happen? I see that  
Cyrus 2.5 also support "create special use", but I can't see no more  
xlist-* configs. It seems that starting from Cyrus>=2.5 only client  
can set flags during CREATE. But what does it happen to previously  
Cyrus2.4 folder-flag associations?

Thank you very much
Best Regards
Marco