I really don’t want to be the party pooper here but, I think, well I think most of us already know, that Beckett will most probably say ‘no’ (sadly) ‘cause I mean we are dealing with Andrew Marlowe guys! He never makes things so simple! So my idea is her saying ‘no’ leaving Castle heart broken. A time period will pass, Beckett will return wanting Castle back and than will be the first few episodes of the season. The rest of the season is if Castle forgivs Beckett, and if they start their relationship again!
(please don’t hate mee! just trying to think logicaly here)