According to a report from Buzznet, members of Green Day have unveiled a new side project dubbed Foxboro Hot Tubs. The band is apparently fronted by Billie Joe Armstrong and seems to be influenced by 60s–era rock'n'roll. No word of which of his Green Day bandmates show up in the project but if their previous output is any indication, both Tre and Mike are likely to appear.
You can check out some music on their myspace page. A free six–song EP is expected soon.