I don't think TDK is a candidate for VR at all and I highly doubt skull mountain will get it since they tested it on nitro, it seems like that's what SF will go with. Either that or bizarro which is a better fit for VR
If MM gets the dive coaster they're rumored to get then gadv will be do much more likely to get the Trex. I don't see MM going with a Trex when there watching closely on 2016s biggest hit (probably) valraven.