730 start date on Walsall-Wolverhampton is on the 13th, according to a driver instructor who has received their diagram for that day (this is assuming that plans don’t change, though WMT must seem relatively confident to start rostering these services).
Initially it will be 2 730 diagrams, with the other 2 being 350s still for the time being. Expected that a subsequent unit will enter service every Sunday afterwards, assuming everything goes smoothly (it seems to have gone quite well for a new units on the soft launch out of Euston, so fingers crossed.