Universal Plasma Brackets

Was going to buy a 50" Panasonic plasma today, but after reading that there's going to be new ones coming out, thought i'd hold out until they are released. So i was going to get a universal wall bracket, but not to sure if its going to be suitable for the new panasonic that are going to come out.

Does anyone know whether they are VESA 400 or 600 or the actual dimensions for the brackets, as they havent actually been released, i cant find the relevant information needed.

If i buy a universal bracket, would it definately fit a 46" + as im not 100% sure which one im going to get. 

When the new batch are released, im going to either get the 46" or 50", depending on the prices and the specs.