[Charles]

It's entirely possible that they launch a new format but no new branding elements right away.

In other words, they could be preparing a new program with Yalda and her team, working on tweaks to the running order and what sorts of stories and reporters they'll include, but otherwise keep everything generically branded as BBC News and not have any kind of new graphics or music or any other ornamental touches to go with it, at least for now.

It seems as though they might be using all their best producers and editors on those rehearsals, as well as figuring out how the UK-opt out is going to work on a day-to-day basis. That might also explain that B-team producers/editors are putting on somewhat thrown-together bulletins right now.

At least that's my guess. It sounds like the big changes come April are all editorial and operational ones, with a bigger rethink of the branding and presentation elements much later once that's all sorted out.