I think the comment section of that article pretty well answers as much as anyone knows at this point.
I really liked MEMMES, but when I last saw them at what I think was its release show, I thought the show wasn't quite as good as it had been in the past even with the same line-up, and I thought their sets lagged behind and focused too much on the Cats/Kittens stuff that has felt a bit worn since 2005. They dedicated "Jeffrey" to me that night, and it was very flattering, but I would rather have heard "New Hero."
I hope the band bounces back in whatever form it takes. I hope they'll just embrace newer material and not keep re-hashing anything from the original EP or the first record.
I would also like to know where or how to keep up with when Joel is doing solo sets.