While all this does soud massively disappointing (and I predicted the hype train to crash from the get go), I'll have to defend GT on 1 little bit (not fully).
For those complaining about Sound, I recommend to wait awhile before saying it is as bad at it is, the sounds could be placeholders for the Demo. Mario Kart 8 did the same thing when it was announced, it used the same sound bits from MK Wii & MK 7 but at release MK 8 had its own sound for everything except for Grumble Volcano, DK Jungle and Koopa Citys music.
As for everything else, granted I don't care for Visuals, Sound or even Online however, what I care about is the Tracks and Racing offline. All the tracs either don't interest me or have appeared in other games so it doesn't matter if I miss it. The new Tokyo track relatively disappoints me just feels bland compared to its R246 counterpart.