"We have added functionality within Digital Editions 1.5 to support mobile devices. At this time we are working hard on rolling out support for the actual devices which work with Digital Editions, which should become available later this year."
Bring it on! Of course for me to take advantage of it, both Adobe and Sony have work to do. So my real expectation is that "later this year" means, at best, "sometime much later".
Thanks for the info, Hadrien!