Worcester have signed Ireland international lock Donncha O'Callaghan from Munster on a two-year contract.
Ospreys have confirmed the signing of Oliver Tomaszczyk on a short-term contract.
Gloucester prop Sila Puafisi will join Glasgow once his Rugby World Cup commitments with Tonga are complete.
Peter Murchie says Glasgow Warriors are relishing the challenge of defending their Guinness PRO12 title this season.
Leo Cullen has been appointed head coach of Leinster after agreeing a two-year deal.
Glasgow have signed Fiji-born winger Junior Bulumakau from the British Army on a one-year contract.
Former Wales International Rhys Thomas has been named captain of Newport Gwent Dragons for the new season.
Bath coach Mike Ford has confirmed he wants to sign Wales and Lions No 8 Taulupe Faletau.
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