She's going to be singing live. She does choreography and vocal coaching every day. The vocal coaching is really just to strengthen her voice and get her to a point where she can go out there every night and do a full show.
Are you not familiar with The Weeknd? I'm beyond ecstatic Usher is following in that direction (at least on one song)
ANTICIPATED UPCOMING RELEASES | ok west
Cloud Nothings, Here and Nowhere Else (1 April 2014)
Mac DeMarco, Salad Days (1 April 2014)
Avery Tare's Slasher Flicks, Enter the Slasher House (8 April 2014)
EMA, The Future's Void (8 April 2014)
The Horrors, Luminous (6 May 2014)