From the Variety article;
Major tentpoles are the most vulnerable should the strike drag on. Warner Bros. execs are nervous about how to proceed with "Justice League of America," which is still uncast and is a crucial potential franchise boasting popular DC Comics characters. While WB expects to move ahead on most of its projects, if the strike extends past February, the studio will have some reevaluating to do.
Paramount, on the other hand, threw four pricey A-list scribes at would-be $100-million franchise "G.I. Joe," which is scheduled to start shooting in February, and swears that the move paid off. Stuart Beattie ("3:10 to Yuma"), John Lee Hancock ("A Perfect World") and Brian Koppleman and David Levien ("Ocean's Thirteen") teamed up in an intense collaboration that yielded, according to di Bonaventura, a shootable script. But will the studio be willing to take a chance on shooting such an important, costly tentpole? The studio insists it will, partly because it isn't chasing big-name stars.
"We have to make sure the actors are not only good but perfectly suited to their roles," says di Bonaventura.
DreamWorks/Par's "Transformers 2" is far enough along to proceed with pre-production, location scouting and advance VFX work, but will face serious issues if the strike continues for several months. Michael Bay's megabudget sequel isn't set to start filming until June.
Fox is moving full speed ahead with its "X-Men" spinoff "Wolverine," even though many roles are still uncast. Unlike "X-Men," "Wolverine" rests solidly on Hugh Jackman's shoulders.
On "X-Men" pics, Parker admits, writers Simon Kinberg and Zak Penn were making adjustments throughout production. "Wolverine" will have no such luxury. Most action sequences will be handled in f/x animation.
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