It would be lovely if they could try to re-create those gorgeous stone houses in one way or another, they were beautiful. And good to know that the Diamond Mine smell will return, not that I really smelt in on any of my more recent visits!
Complete new track and train for Alpenexpress does make sense, it secures the future of the coaster for many years to come and is an opportune time to do it. My only real worry is the throughput implications, hopefully it won't be too badly effected.