I'm probably the most interested to see what manufacturer is providing the trains. Seeing as this is an Intamin standup and the height restriction is coming down from 1.4m to 1.2m, I find it unlikely that B&M will just sweep in and stick their usual floorless trains on it despite the B&M/Giovanola track.
But then again, Mandrill Mayhem is an inverting B&M with vest restraints and a 1.2m height restriction. Could we see Shockwave receive vest-equipped sit-down trains like the ones found on Decepticoaster at Universal Studios Beijing? (
https://rcdb.com/17349.htm) They'd look and ride great but personally, I don't think this is the route Drayton is going down.
Given that the ride is an Intamin, I suspect that Intamin will probably provide the trains as a sort of package deal with Drayton's 2024 Intamin family Lift & Launch coaster. I don't think it would be unreasonable to assume they could have lapbars. But whether they'll be floorless or just your standard sit-downs is still unknown.
On the other hand, Intamin haven't really been seen associating with their older generation rides (please correct me if I'm wrong) with modifications being done under other manufacturers. For example the partial retracking of Colossus at Thorpe Park or the whole TT2 situation with Zamperla. Could a company like Zamperla or Vekoma be the ones sprucing up Shockwave? Only time will tell!
(Apologies for spewing about Shockwave in what's supposed to be a LRod/TT2 thread!)