The new tv is thinner, but they have a pretty big base on their stands to keep them balanced. So just be sure to measure it's stand and your stand's top. The depth I am referring to is the measurement, front to back.
If your stand's top surface is the same or near mine, you're ok, as my stand was made for a flat screen up to 60". If I remember correctly, the part of the DLP that sits on the stand is pretty thin and the fat back hangs over the back.
But in any case, just be sure you have 16" front to back and at least 55" side to side.