Probably waiting for the sequel to the remake to hit theatres. Remember, part 1 came out on blu-ray along with parts 1, 2 and 3 in SE DVDs when the remake hit theatres. Then the blu-rays of parts 2 and 3 and the SEs of parts 4, 5 and 6 came out when the remake came out on DVD/blu-ray. Then parts 7 and 8 came out in time for Halloween (can't totally explain why the blus didn't come out then) but I think it's safe to assume that they're coming out on blu-ray when the sequel hits theatres.
"If a man can bridge the gap between life and death ... I mean, if he can live on after his death, then maybe he was a great man."
- James Dean