Special Forge mode to hit later this year.
Microsoft's still very gung-ho on paper about trying to really support the PC, but seems to be testing and teasing the water instead of just diving in, which is why it should surprise no one that 343 have announced that the PC will be getting 'Halo 5'....well, part of it, anyway.
343 will be releasing a special PC version of the Forge, 'Halo's admittedly impressive multiplayer map making mode. Aside from the obvious, that you can now create maps using a mouse and keyboard, the mode will also allow for 4K resolution, the ability to invite friends to test the map with you, and to share from Windows 10 straight to the Xbox One. Best of all, the mode will be completely free when it launches this year. Yes, it may not be 'Halo 5', but it is going to put a lot more creative power into the hands of their base.
Come on in, Microsoft. The water's fine, really..
Source: 343 Industries