Looks likely that a number of Enviro 400 Hybrids will transfer to Metroline from Stagecoach along with the 32 EVs at Sharston.
The E400Hs I can see transferring - argubly it would be shrewd business from Stagecoach to round up every hybrid in the group that hasn't had a battery replacement and leave it to Metroline!
The EVs I struggle to see transferring though - the Ultra Low Emission Bus Grant that part-funded them was directly between the DfT and Stagecoach (TfGM had a separate infrastructure submission). Unless there's location restrictions on the funding (which I couldn't find with a quick look), I struggle to see why Stagecoach would let such new electric vehicles go...they'd make a useful cascade for some OpCo.
Also, it makes no sense to paint at least one of them into the new trial livery if they'll be going Bee Yellow anyway.
I'm willing to be wrong, as I can't say I'm particularly well informed about Manchester any more. If someone in the know could post a summary of what changes we're expecting from September onwards for Stagecoach (e.g. I've heard the Volvo B9TLs/Scania Omnicities are moving to Tranche 3, but not how they will be backfilled...if that's even the case)