I was going to tell you to do a search since this question has come up often, but I tried to use the search function and it took me two pages to find the answer. With that said, no. GS and P2V+ are not compatible. I was under the impression that a firmware update would make them compatible, but now I've seen posted that the P2V+ will not need the datalink hardware and will have it's own firmware update to use with the software. Sorry, no links, just something I perused.
Either way, save your money...for now. If the latter of my rumors holds true, then you'll get Ground Station functionality basically for free.