I suspect that if the regions do get a virtualization solution along to same lines as ViLoR for local radio that would surely standardise the graphics kit.
From images seen over the years on Twitter BBC News appear to have X number if Viz engines and use them across a larger number of channels / output. I wonder if the cost to increase this for all regions (the peak concurrent usage) means it would be too expensive and they end up with some other solution or would they be able to negotiate a better deal given they will all be in use at the same time for less than 90 minutes per day.
The BBC already have a pretty good deal with Viz AIUI - as they have a LOT of engines across News, Sport and Sport News output across the corporation.
Whether this will scale for every English region though - when other, more cost-effective, solutions are available for the reduced flexibility that the regions require is a different question.
The other big question is whether ViLor-for-TV will deliver an off-site IP solution in a sensible timescale, or of instead a simple, one-size-fits-every-region HD-SDI solution can be designed that gives every SD region an identical HD functionality. If you have a single design you significantly reduce individual design and build costs for each regional centre. You could fabricate off-site and effectively deliver a couple of bays of gear with server, mixer, matrix, CCUs and CGs already installed and prewired.
That said, the ViLoR project allowed them to provide VCS Dira playout for the local stations which wasn't viable with conventional kit, so it might be possible.