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It’s not clear why both companies think they have the rights; our bet is that Warners may have been assigned a long-ago rights grant that Hasbro believes is void. Regardless of the origin of the dispute, it's hard to see how this doesn't end up in court.
Hasbro has an overall movie deal with Universal for films based on its game properties, a deal that hasn’t been the greatest for Universal so far (cough, Battleship). Maybe they got around to listening to us: we suggested the WotC properties for Universal movies back in 2010 (see "Board Game Movies Hurting Universal?").