I don't know any full details on it, but it looks like Gran Turismo 6 may be devoid of proper drag racing... just like every other GT (I am not counting the Las Vegas Drag Strip in GT4, mostly used for testing instead of proper drag racing). I would prefer a proper facility and a proper mode for drag racing, but I'm pretty sure any action that does take place will probably carry over from GT5- mostly in using long stretches at Special Stage Route 7 or whatever.
I am not a drag racing fanatic, but I do love a good drag race. Doesn't matter if it's quarter mile or eighth mile. PD got to step its game up and include some proper drag racing.