My guess on a villain: Cybernetic John Lithgow. After Lithogow's "death" his body fell into an ice cave, where it froze solid and sat for years. In time, treasure hunters are combing the mountains for the famed cash that was lost in the first film. A group of these hikers/treasure seekers comes across a frozen John Lithgow. He is taken to some scientists who are not only experimenting with regenerating frozen tissue, but also experimenting with bionic replacement limbs. Well, I think you can see where this is going - a resurrected, now CYBERNETIC, John Lithgow still wants his cash from the Big Heist. After recruiting a new gang of criminals from the treasure seekers who found his body, he will stop at NOTHING to recover what's rightfully his! There is only one thing standing in his way...Stallone's son, and his rag-tag group of search and rescue mountaineers! Will they be enough to stop the maniacal John Lithgow?
...it's always on On-Demand.