From the Dismemberment Plan web site:
After a few months off, and taking time to think about it, we've decided to break up the band.
There will not be a next album by the Dismemberment Plan. Travis will be going into the studio in April with some songs of his own, and probably a handful, or maybe all, of the songs we worked on as a band to record a solo album. No word yet to which label will release his record. Of course, the remix record is still onwe have 9 or 10 keepers, and are hoping to get another one or two before putting it to press. The remix record will be on DeSoto. And we talked about possibly releasing songs that we've worked on that won't be on Travis' record. For now, all options are open.