Hexus posted a review on the Asus, MSI and Gigabyte ready X299 motherboard offers for retail
A quote from the article:
These firms are all offering promotional gifts and extras to sway your buying decision. Asus emailed HEXUS with pre-order information for its brand new X299 motherboards. It is marketing the ROG STRIX X299-E Gaming, Prime X299 Deluxe or Prime X299 A, and TUF X299 MK1 or MK2 as great LGA 2066 solutions to pair with your shiny new Intel Core-X processor.Asus, MSI and Gigabyte ready X299 motherboard offers for retail @ Hexus
From now until the 16th July buyers of Asus branded X299 motherboards can grab a free game from a range of AAA titles listed by GamesPlanet. Furthermore, if you get your skates on and order before 25th June you will qualify for a free copy of Dawn of War 3 too.