i'm interested in the cake concert also. I bet they sell out, but probably not right away, if the DC fan base is anything like the philadelphia one.
Their new album is alright, but if you ask me its probably their worst one. Like most cake albums, there are some songs that are incredible and some that are so-so. In my opinion, there are less incredible songs on the newest one.
I saw them in philly, though, a couple months ago and they played mainly older songs, though. They played more songs from fashion nugget than their newest one.