They have NOT cancelled the Red, Yellow and Green zone, but the fact remains that these were created by dealers to distinguish one plot from another. As the official map is still not out yet. So, DHA never had any Red, Yellow and Green zones in the first place. It's just something the dealers market created for evaluation and selling of plots.
So, that's correct. However, it's incorrect information that all zones will be given possession on the same time. That has never happened in DHA or any other society in Pakistan to date. So, the Colonel from DHA has just said that there are no Red, Yellow and Green zones and all blocks/sectors will be developed simultaneously.
But of course, the ones which are completed first will be given possession first. That's all.