It's no secret that I like Carvin products. Still, I can understand the thought that we don't "need" another P-Bass. Here's the thing, this isn't just another P-Bass. It's everything from a passive P-bass to a passive PJ to an active P or active PJ. All of these for less money than comparable basses from other companies, and with a huge list of available options. THAT'S what people are excited about.
Lest people think I'm just a Carvin fan boy, I'll let you know that I have a Lakland Skyline Duck Dunn P-Bass that is, for me, the best P-Bass I've ever played. I would be stunned if Carvin's new PB matches my Lakland. I'm planning on getting a PB4, though, because I'd like to have an active PJ. Lakland doesn't make one in my preferred price range, and neither does Fender. I have confidence that the PB4 will be a high quality product, and I already know that the preamp is a winner, as it is the same one currently used in the SB series basses.
Time will tell whether Carvin has a winner, here. It will be quite a feat if they can match the impact their SB Jazz style bass had.