You should definitely wait for it if you plan on watching video information with a lot of motion or fast action (gaming, sports, movies). I have the 40" Samsung of the 66 series (only 60hz) and I was contemplating a Sharp 46" 82U series because of the 120hz. I ultimately decided upon the Samsung only because the 46" Sharp was way to big for my bedroom. Anyway, I would say wait for it because I'm betting you'll use it for sports and so motion blur and other screen artifacts will be even more noticeable in a 52" sized LCD screen. I saw a demo for the Sharp 92U series where the screen was split into 2 sides, one side 60hz, the other 120hz, it was a tremendous difference. Anyway hope this helped.
PS. I mentioned them, you should definitely factor in the Sharp 52" screens, the 82U and their 92U sets, they're amazing (do not factor in the 62U series haha). Their black levels are superior to the Samsung's by a long shot.
I'm looking at the Samsung LNT5265, but am concered about the 60Hz refresh rate. I've read the new 71/81 series will have a 120Hz refresh rate. Is this worth waiting for, or should I take the plunge now? Thanks!