When the BlackBerry PlayBook was first announced there was a lot of folks hoping that it would support DLNA out of the box. DLNA support would have allowed for the PlayBook to connect to various other devices so that content could be shared between them. That didn't happen though and later on down the road there was speculation that it would be added in later. RIM was never signed on previously for the Digital Living Network Alliance and because of that, they never showed up on the Digital Living Network Alliance website. Though if you look now, they are listed among all the other manufacturers. We recently caught a glimpse at some slides that showed RIM was working on wireless media server capabilities for their smartphones but we have to wonder if that will also make its way to the BlackBerry PlayBook.
Source: CrackBerry Forums; Thanks, Superfly_FR!