Guys over at TechPowerUP took first pictures of yet unreleased X299 motherboard.
ASROCK X299 GAMING K6
ASROCK X299 FORMULA OC
ASROCK X299-E ITX/AC
ASROCK X299 KILLER SLI/AC
ASROCK X299 PROFESSIONAL GAMING i9
BIOSTAR X299 RACING GT9
ASUS X299 TUF MARK2
ASUS PRIME X299-A
GIGABYTE X299 AORUS GAMING 9
Source: GDM