Earlier, a retailer claiming to be in attendance at a Sony sales briefing said that Sony had distributed a pamphlet outlining how Vita buyers may be able to make use of their current UMD collection on the new system.
Separate from that, some comments have surfaced from Sony Computer Entertainment development head Yoshio Matsumoto regarding a more obvious method of retaining legacy title support on the new system. In an interview with Dengeki PlayStation this week, Matsumoto said that Sony is looking into offering a service where owners of the UMD version of a game would be able to download the same title at a special price.
It's unclear if the service Matsumoto is speaking about is the same as what the retailer was alluding to. The retailer said details would be announced in the coming days, so we'll hopefully get specifics from Sony soon.