From their announcement:
Attention HeroClix Players: charge your shields, reload your assault rifle, and grab some frag grenades because the Halo universe is coming to ‘Clix.
To celebrate the 10th anniversary of the Halo, WizKids is releasing a 45 figure Halo set that features many classic sculpts from the original Halo Video Game with updated paints, and five never before seen sculpts.