Green Man Gaming is also issuing refunds on Batman: Arkham Knight for the PC until the end of 2015. This is along the same lines as what Valve is doing with the game following a statement from WBIE.
Hi folks. Just a quick little update to let you know that in accordance with WBIE's statement on October 31st regarding Batman: Arkham Knight, we'll be honouring refunds on the title until the end of 2015.

Green Man Gaming states that further information and questions should be directed towards their Helpdesk.