Pre-order installing full game on xbox 1?

so basically i pre-ordered the game on the xbox marketplace and for some reason it has started to download 20gbs. im wondering if this is normal? im somewhat hoping that im receiving the beta or something… but i thought id ask if anyone else has had this happen.

p.s. i just bought it not even 5 minutes before writing this post.

it sounds like an preload and didn’t include the full game. The full game will have 30gb on pc and i guess nearly the same on xbox and there is also an first-day-patch announced.