I believe so! From everything I minimally know about the MK3 development process, this is by far the closest thing i’ve seen consistent with the descriptions i’ve heard. Same kinda roofline, but very progressive design. I really think this photo, which accompanied a technology press release….is the first official hint at the MK3 TT’s design!
src: autoblog
IEDEI 
Nice to see them adding yet more unnecessary “flourishes” to what used to be the cleanest design ever…I love Walter da Silva, but he has ruined the TT.
well this design mock up is for a ‘tech display’ of future technologies….the production form would be much more ‘stripped’ than this……i actually love this shape, influenced from some of the concepts they’ve been showing for a couple of years…..
Looks like they removed the worst line from the mk2 (the one that runs along the side of the car and isn’t horizontal). This is good.