I see its getting released pretty much everywhere now.
March 12th is too late for the UK. She is getting spins already on Capital, and it will go very high since there is hardly no big tracks around at all. Leaving it to March will hurt sales badly.
They'll probably rush it and release it on Sunday here.
Sales wont be hurt, songs have taken 6 Weeks from Radio Release to Single Release in the UK for decades. Lady Gaga is about the only major star to stop doing it, and that kinda worked for her lead single, but it's not gonna work here with this.