Focus Features/Blumhouse’s $15M+ pick-up of Curry Barker’s romantic horror movie, Obsession , has grossed $2.6M in previews between Thursday night and Wednesday shows. Now get this, that number is higher than the previews for Paramount’s Smile, which were $2M, but that movie opened to $22.6M. It remains to be seen whether Obsession plays to that level. The pic’s comps are indie horror movies like A24’s Heretic and Talk to Me and Obsession has already beat those pics’ Friday previews which were $1.2M apiece. Heretic opened to $10.8M, and Talk to Me to $10.4M. Heading into this weekend, literally as of yesterday, it was expected to be a faceoff between the fourth weekend of Lionsgate’s Michael and the third weekend of Devil Wears Prada 2 with about $20M+ each. We’ll see if Obsession upsets. As we told you yesterday, the Barker film about a toxic relationship is winning critics and audiences over at 95% each on Rotten Tomatoes.…