A fellow
DVC member and I just called on Friday to book 4 nights (Jan. 16-19) in a BCV studio. We got Jan. 16, 17, 18 with no problem. But Jan. 19 studios were booked in all DVC resorts except for OKW. So we took Jan. 19 in OKW, but we're waitlisted.
So you will probably be fine to book something in January, with the possible exception of days around MLK Day. If you have no particular preference for resort, you should have no trouble at all getting OKW (which is a gorgeous place to stay).
Good luck as you pursue!
