Specifically, this PR gives a little more detail on the photo printing/viewing/cropping. The latter is sort of unexpected, I don't have an epson photo printer, but it's neat to see them support things like that. The added memory card functionality ought to be nice for anyone who might want to play any PS2/PS1 games between their PS3 and the other systems.
Actually, DLNA 1.5 added a Media Printer class (in addition to Media Controller, Renderer and Server). So I was on the look out for printer support. Not sure if PS3 is really using DLNA 1.5 though (Don't know if it's finalized yet).