USER: openssl s_client -connect imap.gmail.com:993
SERVER: * OK Gimap ready for requests from 98.220.234.148 3if1337572iwn.10
USER: C01 Capability
SERVER: * CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA XLIST CHILDREN XYZZY SASL-IR AUTH=XOAUTH
That SASL-IR and AUTH=XOAUTH is new.
See http://sites.google.com/site/oauthgoog/Home/oauthimap for more on using it (still listed as experimental).