Michael promoted the Thriller album really from late (from mainly 1983) 1982-84. I can't see the point of him doing any major promotion for it, as that would just be Michael Jackson living in the past.
I think if we're lucky (I already have it on video as I bought it in 1984), maybe we will get a 25th Anniversary Making of Michael Jackson's Thriller DVD at the end of the year with new interviews and some bonus footage to celebrate 25yrs since the screening of Thriller in 1983. I think that's about as much promotion Michael should do for Thriller.