The reason this edition KT get a release this big is solely because SW:A surprise success. Otherwise it would probably be a "lol just 8th edition with single model as unit, btw buy the codex for point value". It is the spiritual successor to SW:A in a way.SW:A is confirmed dead and buried.
SW:A belong to the pit of GW anually one-off game such as : Assassinorium Exec Force, Lost Patrol, Gang of Commoragh, IK Renegade etc. Long term support is out of the picture.