I was just browsing the Windows 10 store on my PC. Noticed that Halo Wars 2 is up for pre order. I clicked on Halo Wars 2 Ultimate Edition to see what you get with it. Underneath where it says bundled with it says it comes with Halo Wars Definitive Edition.
The thing is underneath Halo Wars Definitive Edition is says free in small writing. So I clicked on Halo Wars Definitive Edition and it says purchase. So I clicked it and it now says I own it. I can't download it because it's not available until next month.
Checked on my XB1 (its a play anywhere title) and says unavailable until 23rd February. So yer looks like its a glitch and I hope this means I get the game for free. No big deal if I don't as am buying Halo Wars 2 anyhow.