I asked when I bought my ticket which games were included. Though I haven't seen it written down, but that is my recollection.
Makes sense, we have 9 home games in the regular season. If northern rail is the same as last year, we will have 2 home games. Then the first game of the challenge cup was included last season too when we had our thrilling win over Toulouse. So that's the 12 as per the website.