Thanks for posting the link to pics. This thread on Castlespoilers.blogspot.com has some interesting comments about them:
castlespoilers.blogspot.com/2014/03/6x22-title-revealed.html
As for Bracken issue, 22nd (penultimate) episode of Castle will be called Veritas (Latin for truth). The epithet on Johanna Beckett's tombstone is "Vincit Omnia Veritas" ("Truth conquers all"), so I'm preatty sure this episode will involve Bracken in some way. Maybe they'll close that storyline, and then leave the finale for the wedding episode.
Anyway, next episode is on April 21st, so we have plenty of time for speculations.
