In a last-minute move 343 Industries has announced that Microsoft will not be launching a physical release for Halo Wars 2 on PC.
In a post on Halo Waypoint, Brian Jarrard, 343's community manager, stated that "retail plans have shifted and Microsoft has made the decision to focus the release of the physical retail version to Europe only."
The digital version of Halo Wars 2 on PC will still be available worldwide when the game launches next Tuesday on PC and Xbox One. However only Europe will get physical copies of the game for PC.
While the change is rather last-minute, it likely wont' affect game sales too much. Not many gamers still want physical copies, as evidenced by the sheer size of Steam's online community. Would still be nice to have the option but its likely that the cost of shipping the game outweighs the gains for Microsoft.