Ok, so while the "official" PSP v2.0 firmware for the US hasn't been released, it has been confirmed that the Japanese release that came out today will in fact work. Here's what you need to do:
I've just installed it. I'm so excited about being able to finally use the WAN feature. Up to this point I haven't been willing to move back from WPA-SKA to WEP.
A couple of things I noticed off the bat. The "Themes" configuration looks pretty cool—you can finally set your favorite color scheme, keep the default monthly rotation or set your own Wallpaper!
The new internal browser looks way cool too!