Leesley has been released by Harrogate, and Massanka is still under contract at South Shields. I'd expect Hanson to leave Farsley (they've announced who is still under contract for them for next season already, Hanson wasn't included).
Dewhurst and Seriki will surely either get higher division loan moves, or be on the fringes at Sheffield United. Seriki had already played for the Blades this season.