I'm very novice when it comes to flying and I fly helis instead of planes but I have the original DX8 and its an extremely capable radio. I dont see why it wouldnt but Id probably wait until someone more in to flying planes can answer
I can't remember if the DX8 was DSM or DSM2. If it is DSM it will not be compatible. If it is DSM2 it should work fine. The newer stuff is DMX but is still backward compatible with the DSM2 protocol.