Dartblaster.de saw this at the Nuremberg Toy Fair, here’s the press release from Nerf!
NERF ZOMBIE STRIKE DOUBLESTRIKE Blaster
(Ages 8 years & up/Approx. Retail Price: $9.99/Available: Fall 14)
When zombies are on the loose, double dart firing power is a necessity. Load two ZOMBIE STRIKE darts into the DOUBLESTRIKE blaster, pull back on the hammer mechanism, and fire to unleash both darts in a row! Blaster includes two ZOMBIE STRIKE darts. Available at most retailers nationwide and Hasbrotoyshop.com.