The company hasn't committed to an official release date, although Amazon lists the CP1 as arriving on June 21st (we'd take that with a grain of salt until Sony says otherwise).

As it is, both Digital Paper variants will receive some welcome upgrades on May 30th. There's a new mobile app for Android and iOS to help shuttle documents to the device. You'll get screen capture and video output modes for sharing your work with a larger crowd, support for smart forms (including interactive PDFs), a page jump feature, view panning, automatic page rotation and a thumbnail viewing mode to survey files at a glance. If you want to use Sony's slate as a part of your professional workflow, it should be a little easier going forward.