Castle will have it's fill of light hearted episodes in season 7, starting in the second episode.
Castle Spoilers: Castle Spills His Wedding Plans For Season 7
Even though Rick's wedding was interrupted in the season 6 finale of Castle, Nathan Fillion spoils that Rick is still ready to marry Kate.
Castle Spoilers: Nathan Fillion On An Impending Wedding, Rick's Return, Beyond Season 7 and Much More!
Nathan also teases Castle's return from his seemingly fiery death, an emending wedding and what lies ahead of season 7 for Castle.