At least, according to Barry M. Bloom of MLB.com it is:

WBC roster announcements according to @mlb: 10 am ET Thurs for USA, 4 pm for rest on MLB Net. MLB.com with complete coverage.

— Barry M. Bloom (@Boomskie) January 13, 2013

Judging by the time of 10 AM, I’m guessing that we will see the rosters revealed on the Hot Stove program of MLB Network. MLB Network will likely have a special about the rest at 4 (EDITED IN LATER: Yes, they will.). And I, of course, will be doing reviews and news on the Continuum as well.