Eh. It might have been a surprise that it happened -right then-, but that it happened... not so much. If enough people care about something, I expect it to get hacked sooner or later whatever it is.
The big question is the when. Look at the PS2, it was pretty close to end-of-life before things really started coming together for a softmod for it. It wouldn't be all that surprising if it was like that with the Vita... Wouldn't be all that surprising if a game shipped to stores with some kind of godawful bug within the next six months, either.