Both Mark and the drummer left a couple of weeks ago, one of their guitarists left a couple of months ago. As far as I understand they wanted to focus on other projects, including Mark's Low end University. This left just Chris Letchford, who writes all/most of the bands material anyway. The new drummer was announced quite recently but yet to fill in the other roles
Been a fan of the band for quite a few years now, I love Mark's playing on The Migration, excellent feel and approach to melody. Couldn't quite get used to his tone on the latest album, though.