She hasn't been in LA (that we know of) since the Oscars and the only time she ever flies out there is to attend an awards show or for something work related.
IF she performs at the Grammys, the single will likely be out for awhile by then so she could be out there preparing to release the single? It's hard to guess because we have no idea how she'll announce the single. It will probably be very last minute. For all we know it could be coming Monday or Tuesday or next week at this point.
It's kind of exciting that she's out there though.
