[DTV]

Because the channel is launching in studio C (which is pretty much being read its last rights in terms of equipment failures) with BBC World News presenters to boot talking about the UK Finance Minister, plus legacy BBC World News branded segments such as World Business Report. 

The core/main feed is clearly the 'Global stream' with the ability for the UK to opt out of that. Not the other way around. So it will likely be BBC World News being broadcast in the UK, with a few domestic stories thrown in and the Around the UK feature filler while World News is running adverts.

Which studio it comes from and who is presenting doesn't really matter. Every stage of the phasing in of the merged channel has had far more UK news on it than the pessimists on here predicted - the last 'interim' month hasn't even been a compromise position, holding a broadly similar UK-World lean to the former News channel. There is so much precedent that UK news is hardly going to be underserved, that the idea they're going to go full 2010-era World News from next Monday just seems highly unlikely.