MGM does not own the Dark Shadows films. Warners does.
MGM only owns MGM films made from 1986 on, plus UA, AIP and other libraries.
Warners owns all Warners & First National titles, all MGM films up to 1986, plus Allied Artists and other titles.
Sony buying MGM puts the films in a better position than they would have been if Time Warner had succeeded in buying MGM.
The problem with Warners has been the enormous film library of higher priority titles (at least to Warners) that they feel should be released before HODS and NODS...If Warners who owns the largest classic film library had acquired the 3,000 or so titles MGM owned, we'd be looking at an even longer waiting window before they turn their attentions to NODS...
I read yesterday's news with a sigh of relief, somewhat.