Now that v2.0 seems to be getting stable, I finally started v2.1 branch: http://hg.dovecot.org/dovecot-2.1/

So far there are just some API changes to fix some annoyances and to make it simpler. They'll probably keep coming for a while more to make future work easier.

As for larger upcoming features, I'm hoping for:

• simplify index files and make it write only via lib-fs (but keep backwards compatibility & make v2.0 forwards compatible)
• make lib-storage API support asynchronous and support parallel lookups
• use async disk io as much as possible & get rid of all lock waits inside lib-storage -> it'll be ok to have lots of imap/pop3 connections per process, at least for some storage backends
• write imap-client lib-storage backend (make it fast using above async stuff - using configurable number of IMAP connections)
  • this could maybe also be used to access other users' shared mailboxes when it can't be done directly
• design a mailbox format (maybe based on dbox) for key-value databases, implement it via lib-fs and implement a lib-fs backend for one such database
• merge Apple's CATENATE and URLAUTH patch

But if some company desperately wants me to work on other stuff, that list can change.

BTW. I'm moving back to Finland in two weeks. Maybe I'll also get some studying done towards my Master's degree. :)