Were you expecting to be on a 380? It looks like a 747 is operating BA208 for two days - 9 and 10 November.
It would be unsurprising if this were related to events yesterday, although that is mere speculation on my part:
https://www.flyertalk.com/forum/brit...ng-7700-a.html
If you want to keep your booking, why do anything? Surely you only need to contact BA if you want to change?