Here's a bit of info on an open call from Third Flatiron for a SF antho I spotted over on AbsoluteWrite.com:
"The theme for Hyperpowers features space opera and military science fiction stories. Space operas are dramatic, large-scale science fiction adventures focusing on character and plot action. We’ll be looking for page-turners, adventure stories that keep us on the edge of our seats. Mindless mayhem just doesn’t cut it. We want compelling science fiction tales that wake our emotions and stimulate our imagination. Submissions are open and are due March 15."
For more information, check out Third Flatiron's submission guidelines page here.