What I know is that it shoots a variety of formats DVCProHD (which is 720i as opposed to 1080), it also offers DVCPro50 and DVCPro25 and regular DV. It can offer all of these because it stores onto cards instead of tape, which also means faster digitisation.
For the money, £5K, that's a pretty impressive set of options. What I like about it is that it's a cheap camcorder that offers am range of pro options other than HDV; as I'm a real fan of DVCPro50 and DVCProHD it's a camera that I'm really keen to test out.
The HVX100 was an excellent camera, that is well loved amongst indie film-makers. The only concern that I have is that the P2 is a brand new technology that is as yet untested by film-makers. I know that tape is on the way out, but if you go for the first version of any new camera system the price you invaribly pay is working out the bugs for the manufacturer. If you look at any new camera product launch after nine months there is a new version of that camera and the various notice boards warn people not to buy the first version because it had "insert description of annoying post production problem."
I'm keen to try this camera, but I'd have to hire it and get it through the complete workflow before making a decision.