Sega accidentally released details of a Sega/Sony meeting from August 5th. The meeting touched on multiple topics, but here are the interesting tidbits.
Their looking into putting PS2 and Dreamcast games on PSN, 2010 (March in specific for Japan) launch for Sony’s motion controller, A import section on PSN (Specifically mentioned Yakuza series) with minimal localization; example: translated menus and subtitles , and a Sonic Anniversary Collection with all the old Sonic games on a single Blu-ray disc.
These are just plans though, so they could have changed since then. But it gives us a glimpse at what Sony and Sega may be bringing for the future. You can check out the full list of details over on Neogaf’s forums.