According to the tweet, the phone will be available in “Mystic White, Astro Black, and Ice Platinum”. These correspond to white with gold sides, black with silver sides, and gray with gray sides. The white and black models seem to have a glossy finish whereas the gray model has a brushed metal finish on the back.
The color also extends to the front of the device, meaning the bezel is the same color as that of the back of the phone. Considering the phone has very minimal bezels this shouldn’t be a major concern.
The image also shows the date Sunday, February 26 at 12:00PM, which is also when the LG MWC event is scheduled for.