Even with the Japanese delay, the Skype functionality has been available worldwide for a few months now. It appears Sony is just now bringing an official PSP-2000 Skype headset to Japan, complete with a remote control. The headset can still be used with the original PSP, as a pair of headphones, but the specific input on the upcoming microphone will only fit the PSP Slim model.
Coming next month, this headset will be compatible with Skype and Talkman software, for 3,800 yen. The official model number is PSPJ-15012.