So, yesterday we heard, via a consumer survey posted on Joystiq, Sony might possibly be considering thinking about wondering about potentially working on a download rental service for the PSP. It certainly sounds like a logical and profitable venture, which is why it's not that surprising that reports have now surfaced that Sony in fact secretly briefed developers at this year's GDC back in March about the prospective rental service.
According to a source that spoke to Develop magazine, Sony held private meetings with several development studios at GDC, outlining the service and providing documentation to support it. This certainly makes for a meatier rumor, especially since it suggests that Sony is more than just fantasizing about this service.
Plus, as Develop points out, Sony's recent digital-only release of Patapon 2 marked a significant shift away from the UMD model rumored to be on the way out, and seems like a pretty good indication that Sony is looking to go all digital for the PSP, and possibly UMD-less for the still shadowy PSP 2.
Of course, without official confirmation regarding Sony's intentions, we'll just have to keep on speculating for now. Good thing we're used to it.