So both December and January has two reveals, eh? Maybe Sakurai is accelerating the pace of character reveals?
I don't think 2 character reveals for February would be out of the question. Diddy could get revealed on the release date for DKC: Tropical Freeze while some other character could get revealed during a Nintendo Direct. And every main Direct (the bimonthly ones) has had a character reveal so I'm fairly certain that trend will continue.
Who's worthy to be revealed in a Direct though? People say Diddy could get revealed in a Direct, but so far only important characters have gotten Direct reveals. August had Luigi for Year of Luigi, October had Sonic because a returning 3rd party character is big news, and December had Rosalina who is a newcomer. Maybe there's hope for Palutena!