No press release yet, but with CES upcoming companies are "slipping out" details on CES-specific pages on their websites. Sony is no different, and it looks like, according to their site, that Skype is finally coming to the PSP.
Details are scarce at the moment (i.e., nonexistent), but the company makes clear mention of a Skype client for the handheld game system on its CES 2008 promo site, which is pretty official -- though we're gonna hold our breath a little till we see a press release.
Of course, until there's a press release, they could always pull back on this (editing the page would be so easy!), but at least for now it looks like PSPs are finally going to get VoIP functionality.