As far as I'm aware Glasgow will likely get more London services and more capacity on existing services, through there being more Pendolinos available and 11 car sets. However, I've also heard suggestions that Glasgow-London services will be speeded up by missing out Lake District calls, meaning more reliance on TPE for picking up those passengers
There is no change in the number of West Coast services between Glasgow and Euston, they are simply being retimed, with the early morning southbound and late evening northbound being swapped to TPE (as above)
This will allow even fewer stops on these services, much to the annoyance of several MPs who have found out about this
The offset is an increase in services between Scotland - Carlisle - Preston, by all three service corridors (TPE, West Coast Euston and West Coast Birmingham)
Sadly the 11 car sets won't make much difference, the details won't be known until the franchisee decides what the 9 car Class 390 units will operate (DfT had advised me the provision would be completely random)
Yes, the Euston services are to have reduced journey times, details are in the franchise documents
Yes, some services will drop the stops between Carlisle and Preston, where they currently stop there
Equally, Preston will become the last stop, removing the duplication at Wigan and Warrington
A similar change of service pattern will apply to Scotland - Birmingham services