Touchscreens seem very 2006, I don't think it adds much. Something like what Sky had at the election, with graphics making use of empty space is far more impressive I think. I know the BBC do this a bit with the papers.
In regards to the "main" BBC news studio in the newsroom (E I think), I have always seen this as a temporary studio. It is just a bit of glass dividing an open space at the end of the day. Yes I know it is all wired up and far more complex than that. At some stage the set and the background (i.e the newsroom) is going to look dated and old, and you can't do much with it at that stage. It is fine at the moment. You can perhaps change a few colours and shapes etc and give it a bit more life, but I can't see it lasting too long beyond 2025. At which stage they will need to move somewhere else. A studio with more space where they can actually build something new. The "old" Newsnight studio would be a good choice?
Speaking of modernisation, why is it that British news channels seem to spend an age getting to reporting the news at the top of each hour? They start with video clips of each story, give a short explanation, then have a big introduction, and then finally we get the news. This is far too slow. It takes about a minute and a half for the BBC to actually start. I found a German example where is takes about 20 seconds. As much as I love the big introductions, especially the old Sky News style (Live from the Sky News Centre, this is Sky.... etc) the world has moved on. People want things to start quickly. Not visit the Newsroom for a tour.
It's noticable with bulletins from about 15-20 years ago how much more pacy the introductions are. The headlines & title sequence are done within half a minute or so and you're straight into the meat of the bulletin.Whereas now the opening goes on so long you almost don't need to bother with the bulletin.
I guess the advantage of B not being used is that if E does start to look stale, there's time to adapt B so less floor crew are needed/more can be automated or, while Studio E is updated, some programmes can move into B pretty easily while it's updated.
Surprised Sky haven't decided to use those AR graphics more often - with the election they proved it's possible and it's an easy way to vary the presentation and show off Sky Central. Seeing that corridor and the big screen all the time can be a bit tiresome.