Not all of the events are based at these areas, having new trains running into New St especially if branded for the games
I think having them ready, even if they don't actually serve Perry Barr for the big events (I must check the exact location of the athletics events I'm going to, mental note made), will do WMR the world of good from a marketing point of view.
Something along the lines of 'look at our shiny new trains, more of them are coming soon' and actually give the passengers of the Midlands something to be happy and proud about.
Of course, having them in service during the Games might help push other trains into availability for crowd-busting purposes too. I'm not too sure on how that might work though, certainly not so much within Birmingham but on the longer distance services from places like Hereford, Shrewsbury and such like the 196s could come in handy for additional/extended services?
No matter what they end up on during the Games, they will be happily welcomed here and I am already planning a day out on a West Midlands Day Ranger to travel on some