Beyoncé will indeed be singing a song at the Grammy awards later this month.
The announcement was made using the medium of a video which basically lists all the performers and Beyoncé (and Mr Knowles) are both on it.
You can watch said video below.
[youtube]5Je6CGqGII0[/youtube]
The Grammys take place this Sunday and also feature performances from Katy Perry, Lorde and John Legend.