This FAQ was snatched from the Wizkids forum:
Q: What is Halo ActionClix?
A: It is a pre-painted, plastic miniature, table top game based on the award winning Clix game engine and featuring the incredible content of the Halo universe.
Q: How is ActionClix different from HeroClix and HorrorClix?
A: ActionClix focuses on the video game genre and features specialized game mechanics, like weapon swapping and figure re-spawning, that reflect the excitement of video game play. HeroClix is focused on the comic book super hero genre and HorrorClix focuses on the horror movie genre. These games have mechanics that reflect what’s fun about those genres.
Q: Is ActionClix compatible with HeroClix and HorrorClix?
A: The simple answer is yes. All of these games share the same basic combat stats and 2d6 combat resolution system. They are all at the same scale and played on the same kind of grid maps. Like HorrorClix, ActionClix will feature character cards. However, the ActionClix game environment includes mechanics not found in HeroClix or HorrorClix, and is intended to provide a different game experience. WizKids’ sanctioned tournaments for each game will remain distinct.
Q: How does weapon swapping work?
A: Players can bring a number of special swap figures to the table, each with a different weapon type. They can choose one figure to start the game and place the others off the map in a sideboard area. During the game circumstances may allow the player to swap his shotgun figure (for example) with his rocket launcher figure from his sideboard. Look for more details on this mechanic as the release date approaches.
Q: How does figure re-spawn work?
A: In ActionClix some figures don’t leave the game when they click to the bottom of their dial. They reappear on the map at a re-spawn point – just like in video games. Re-spawn allows the game to be much more lethal and still be fun.
Q: What Halo vehicles are planned?
A: There are several Halo vehicles in the works. Right now we are ready to confirm that we will have the Warthog. We will announce more vehicles later.
Q: What can you say about the Halo 3 preview content?
A: Absolutely nothing - and keeping our mouths shut is killing us because the stuff we have been working with is absolutely awesome.
Q: What is the big surprise planned for San Diego Comic Con?
A: If we told you, it wouldn’t be a surprise, but it is totally cool. There has never been anything quite like it before.
Doesn't really tell us much but oh well its something to read