[ALV]

Will BBC World News also lose its branding from 6 March, just to be known as BBC News from this date? Or will that happen from 3 April?

I guess the on-screen BBC World News branding could still stay for another month, but presenters will only be able to name check BBC WN on air when the UK opts out for Breakfast and the 1, 6 & 10.

Not so sure that it will stay: BBC website still does not have any schedules for "BBC World News" starting from 6 March.
www.bbc.co.uk 
For "BBC News" or other channels like BBC One or Two, however, schedules for 6 March are already there for some time.
www.bbc.co.uk 
Might be something, might be nothing.

The text schedule for the distributors still lists Live, Impact and Global on March 6th... I assume the scheduling decisions are made in the last minute and they need time to revamp the schedule...

www.bbcworldnews.com