The Tomorrow Party, founded about a month ago to unite anti-Noda forces to the left of the LDP, will break up.
It looks like Ichirō Ozawa will take most of their elected members and probably re-join the DPJ, which just elected a new leader who's close to Ozawa.
The rump Tomorrow Party will be strongly left-wing but only have 2 or 3 elected members.
They only have one Diet member and are thus derecognized. Ozawa Ichiro will probably stick it out on his own as his new group will get official recognition, though he may go back to the DPJ. The only remaining Tomorrow Party Diet member is a recent defectee from the SDP who may go back there, or she may join the environmentalist/anti-nuclear Green Wind, which lost its two Representatives at the election but has four Councillors and thus needs another member for official recognition (which requires five Diet members across both houses). No idea what Kada Yukiko will do, but presumably her fantastic adventure into national politics is over. Unfortunate; I like her.