It's more of a ~very~ educated guess. Considering the occasion and the age of the 3 songs we already have, there's no way she's sticking to them after such a long cooling period. We should at the very least be getting a new song, possibly 2, assuming the guests have 2 performance slots like before . 45S and AO seem like definite no's and BBHMM is the most likely choice, but still somewhat iffy.
If LOTB was meant to be released by now and performed at the Brits, that could very well be a go-to song.
Her impact over me. 
Rihanna ha mystical power. 