We were told to expect Advanced Remote Play functionality in today's big PS3 update (version 1.6). Looks like we were played the fool: you will not be able to access your PS3's content from any wi-fi point: once again, you must be in wireless range of your PS3. Until they correct this, the Remote Play functionality loses a lot of its purpose: what's the point of being tethered so close to the system?
There are some improvements made in this firmware revision, but they are very subtle. You'll be able to easily register a PSP for Remote Play use by accessing Remote Play from System Settings on PS3. Also, you'll be able to connect a wi-fi bridge to 20GB PS3s, allowing them to interface with PSP like the 60GB versions do.