"Your new home" and "Your new body" do not sound like what you'd say if you restored someone to their original body. My guess is that it's going to be some kind of scam, trying to convince the X-Men this is Betsy and it isn't.
Or, you know, Fraction is just that hackneyed and doesn't realize that restoring Psylocke to her british form IN NO WAY MAKES HER A LESS CONFUSING CHARACTER at this point. Seriously, I realize that British Betsy was a more well-rounded character, and that Claremont has written Asian-Betsy horribly for decades now, but another bodyswitch really doesn't undo that.
It would make for good comedy if Betsy was really switched back and was appaled to find herself a somewhat dumpy, unathletic British girl instead of the sex symbol ninja she's used to by now. I figure there'd be a very long "NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO" involved ;)