Universal Apps are Already Here!

Hi all,

So I bought Halo: Spartan Assault for Windows 8 when it first came out and last night I was fiddling with my phone after I upgraded to WindowsPhone8.1 and when I was looking through My Apps, to my surprise Halo: SA was there and I was able to install it and run it without having to buy it again!

Anyone got other apps/games that were bought on one platform and not the other to install without trouble?