It’s been on the cards since September last year (when it was called Project Comet).
They describe Vox as half blogging platform and half social network. It looks like a pretty entry level kind of product and I’m not sure how much it will offer most ProBloggers but it will definately be something worth taking a look at.
Source: TechCrunch » SixApart To Launch Comet, Renamed Vox, on June 1