As far as I know, this is just a rumor.
While the Hot Wheels DeLorean has done well, thanks to DMC and everyone here, I think releasing another version would be too much of a good thing. Keep in mind that there was three versions of the New Model (silver, gold, black) and one Fast Than Ever the following year, total of four. If you include the Time Machine version, that is sorta counts as another one. This should be the end of the run for a while (as stated by Cory).
There will be a Comic Con Exclusive of the Time Machine. See the thread in this forum, for more information.