Series 7 chipsets were the last ones that came together with 8257x controllers.
Series 8 will almost always be built with a i21x ethernet controller due to intel bundling them together for a discount. Some of these discounts are probably pretty big, its the only way I can explain certain motherboards with onboard 10GbE being as cheap as they are. (~$400 for brand new X540 dual port, ~$500 if you want a LGA2011 board and SAS HBA glued to it)
There might be hard to find exceptions (don't know any off top of my head) and likely cost more than just getting a separate card. So unless your case cannot fit a card, there is your solution :)
That is also assuming they don't go the typical ultra-cheap route and just use a realjunk controller instead.