Viz still does that. Called Viz Virtual Studio and it works on physical monitors and LED screens. But that requires tracking on each camera which is an additional expense.
Which studio is GMB in? Studio TC3?
Correct. From what I've heard, GMB are sharing with This Morning. This means that set won't be too different to GMB's set, unless they re-dress it completely, like Lorraine and Loose Women in TLS.
GMB and This Morning are going to have sets on opposite sides of TC3. This can be seen on Ben Shephard’s Instagram page.