Any hints on new HD model intro??

Hi, new member here..I'm trying to decide what to do with my '99 powerstroke F250HD..

I need /want a 4 dr model(Have ext cab now) and want the new 6.0, but wonder when the new bodystyle will be out so I don't regret it in a year or two if I were to take the plunge now.

Any hints??

Cheers,