New "Sprint" Express buses should be running Walsall-Perry Barr(stadium)-Birmingham-Airport/NEC.
Learn more about Sprint - Sprint is a bus priority corridor that will link Walsall to Solihull and Birmingham Airport in one continuous route.
www.tfwm.org.uk
The road works are "almost" complete, but it will be touch and go.
The Sprint buses will be run by National Express
National Express to run zero-emission Sprint bus services
www.wmca.org.uk
There is also the transport for athletes between the athletes village and the events. I think this may be the Stagecoach contract, but I am not certain.
Perry Barr (railway) station is also closed for a rebuild and due to re-open before the games, but this is about a mile from the stadium so must people will still need to use the bus.
I expect they are holding back until they know exactly what will/will not be open for the games.
All games tickets will be valid for use on public transport
https://www.birmingham2022.com/tickets