The trend has generally been Marvel filling out existing OHC lines from the beginning of Now (Thor, Guardians, Daredevil, ANXM, UXM, ASM) and also a few of the newer high profile series (Ms. Marvel, Squirrel Girl). There haven't been any new OHCs of older Now series, if that makes any sense. To see everything, check my Omnibus DB, filter it to "OHC only"
I'd link you to my Omnibus guide filtered for OHCs, but I'm still filling in some release dates for OHCs and it will be more useful to you once I'm through