The Wiki on this states:
Allyson Smith, the Henson Company's VP of New Media, responded to a question on Twitter about the project's status on April 16, 2009:
Development [of the Dark Crystal sequel] moves fwd, paying attention to what will serve fans & DC best. No details to announce. Check henson.com for updates.
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So, it seems like another snag, but they want to move forward. Next month's Comic Con should hold more answers. People will be asking. It's just how many times can they pitch the same project before people grow weary from the spin? I just wanna movie.