One of the videos, as posted on GameSpot's YouTube channel shows how Halo 5: Guardians' multiplayer maps like Molten, Coliseum and Plaza look at the higher 4K resolution that's possible with the Halo 5: Forge map editor on Windows 10.
The second clip shows gameplay on the new Mercy map while playing Halo 5: Forge on the PC. Mercy will be one of the new additions for the upcoming Anvil's Legacy update, which will be released both for Halo 5: Forge as well as Halo 5: Guardians for the Xbox One. You might be able to notice that the UI in the game has been made for a mouse and keyboard, so that players can quickly adjust settings like look sensitivity. The game can also be played on standard controllers as well.
Halo 5: Forge will be released for free in the Windows Store on September 8. Late last week, Microsoft revealed the system requirements needed to run Halo 5: Forge on a PC in minimal, recommended and ultra settings.