We now have a supposed schedule for the new flights (from airliners.net)
DXB/HAM 0855/1255
HAM/JFK 1440/1700
JFK/HAM 2315/1235+1
HAM/DXB 1415/2325
The existing direct JFK (EK201) also departs DXB at 0830 and returns from JFK at 2300. Very similar timings to the new flight.
Yes, EK has 5th freedom traffic rights between HAM-JFK vv.
Cheers