A) When will MM 2.1 be available

Beta1 is due soon. There were some bugs this week that were stomped last night. (I don't speak for Barry so I won't say anything about schedules.)

B) If it will incorporate foreign language support for admin and lookup pages

Absolutely. http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/mailman/mailman/NEWS?rev=2.28&con tent-type=text/vnd.viewcvs-markup