Ahem.
I think we need to slow down this hype train just a tad bit. This is PD we're talking about guys.
Yep. Not only GT6's GPS feature is not going to be released this year, but also relies on the degree of customization the track creator provides and, most importantly, on if the GPS readings can be used with that tool.
If both aren't great, spectacular even, then everyone is having their hopes way up. All remember GPS tracking is not that accurate, particularly for elevation changes and bumps, and without customization there won't be practically any use for it. So, if there isn't GPS data integration with the track creator or if the track creator itself is not good enough, then GPS-made circuits and point-to-point stages will not have buildings/scenery, with incorrect width and apexes, flat roads, etc.
Finally, even if all conditions are met still the final work won't look anywhere near as what the real place looks like, because the tool certainly won't allow pictures and importing modeled assets. This aspect is of the essence on a realistic looking game, not so much in cartoony ones. The way to solving this a bit would be the game to include tons and tons of used and unused textures and models, from existent GT6 circuits and lots of assets especially made for this tool to work, which is not going to happen.
All that means GPS tracking will be rather gimmicky. The hype train is way too strong on this one. If anyone wants to play their local track or road then search (google) if it is already made for rfactor or another game/sim, and if it isn't then the only solution is to make it from scratch on a PC. That or using the a google maps 2d car site, which isn't the same but it's something.