NO, colour MDF is showing up as standard equipment now on the GTD spec of the GTD/GTI page. As GTI shows only items that exceed GTD spec then it is also included on GTI.
Car prices haven't gone up on the GTD/GTI, but all options seem to have gone up, some by not even 1% (ACC/DCC - gone from £795 to £800), some by 25% (White paint - now £250 instead of £200, metallic paints are up by 5%/£25).