Firefox 2.0.0.15 - This is scheduled for release either on July 1st or 2nd. Should have a more finite date after Monday’s Weekly Update Meeting.
Firefox 3.0.1 - No official time frame yet, but likely sometime in August.
Firefox 3.1 - Preliminary draft released in early June. First Alpha due out in mid July with final release by year end.
Thunderbird 2.0.0.15 - Contingent on the release of Firefox 2.0.0.15. If the Firefox release goes well look for Thunderbird release around July 15 or 16th. Schedule
Thunderbird 3.0a2 - Tentatively scheduled for release sometime towards the end of July. Code freeze scheduled for July 8th.