I'm thinking that we might be seeing a cross between an Intamin Mine Train Coaster and a Mega-Lite. The SW6 track seems identical to the track seen on Mine Train Coasters, bi-rail with the cylindrical diagonal bars:
Mine Train Ulven, an Intamin Mine Train Coaster.
The one other Mine Train Coaster in the world that is due to open this year at Happy Valley also has the same track. If SW6 was to be a Mine Train Coaster, then we could well be seeing a wheel lift hill rather than a chain, and the bit of straight track seen on the right in this
picture is definitely for some sort of kicker wheels, however it's hard to say if it is going to be for the lift hill or part of the track around the station building/brake run.
After saying all of that though, SW6's layout is much more similar to those of Intamin Mega-Lites, with a drop followed by a 270 degree helix and then an air time hill. Also, SW6 is higher and has a bigger drop than the current Mine Train Coasters around, although Intamin do say they can "meet any park's requirements" with the Mine Train Coaster.
It's an interesting one, and for now I'm going to say that it will be a cross between these two different models, they certainly seem to be the two models that are most similar to what we have seen of SW6 so far.