Oh yeah, I forgot about that... then this will span over 25 episodes like last time. 12 episodes isn't enough to squeeze in matches against three schools (Kirisaki, Touo, and Yosen), not to mention they have the whole back-story regarding a lot of people).
So to probably sum up the Winter Cup: (training and minor events occurring in between every now and then)
One or two episodes for showing highlights of the Preliminaries of Seirin plus some explaining and training
Two or three episodes on the tie match between Seirin vs Shuutoku (I totally forgot about this match)
A total of four to five episodes on Seirin vs Kirisaki - two episodes regarding the backstory, two or three on the actual match
Three episodes on Seirin vs Touou in the first round
Approximately five episodes or so on Seirin vs Yosen - two or three episodes regarding backstory (both Himuro and Murasakibara), two or three on the actual match. This could actually take up a lot more than expected.
It's already around 18 episodes like this, and we're already in two episodes. If they squeeze in any extra events (or lengthen some of the matches/backstory), it'll make 25 episodes easily (I'm sure there are still some matches that I missed and didn't write in the above). I doubt they would have time to feature Kise vs Haizaki within this season since it is heavily backstory-oriented.