NBC UNVEILS NEW MID-SEASON 2012 SCHEDULE
The item of interest is in this detail for Friday programming:
The returning series "Who Do You Think You Are?" makes its season debut on Friday 3 (8-9 p.m.). "Chuck" will have its two-hour finale on January 27th (8-10 p.m. ET). "Grimm" (9-10 p.m. ET) and "Dateline NBC" (10-11 p.m. ET) remain in their respective time periods.
I guess this means that "Chuck" goes off the air opening up the slot for WDYTYA. This is the same time slot it occupied early this year in its second season. No word yet on what celebrities will be featured.