A6-EGK is operating tonights EK38 which is a 3 class configured plane, so they really can change it at the last minute because earlier today it was still down to be a 2 class model with lie flats in J.
Also, if you look at the 'Services by Flight' on the Emirates website for tonights flight it comes back with no details now because of the late equipment change.
Tonights flight will certainly have lie flats!!