IbizaPocholo
NeoGAFs Kent Brockman
https://www.windowscentral.com/xbox-career-system
The new Career system could be the extended Gamerscore system Ybarra teased to us in a previous interview, where he noted that Gamerscore doesn't fairly represent the accomplishments of esports players or other gamers who might spend the majority of their time in a single game. This new Xbox Career feature might alleviate that.
It appears that players using this new Career system will be able to obtain levels, and even prestige ranks, obtaining rewards such as loot crates which come with cosmetic items for the new Avatars system.
The Career system also comes with Quests to complete specific objectives, such as playing certain games, which will also come with crate and experience points as rewards. At this time, it doesn't look as though loot crates will be purchasable with real money, but it's probably too early to say whether that will be the case later on.
The documentation we received refers to a new subdomain on Xbox Live, "Career.XboxLive.com," which isn't yet available for public access. It also seems that these systems will incorporate achievements in some way, rewarding experience points that contribute toward levels in your overarching career. The systems track your progress and play time in your existing game library, and it looks as though it will all work alongside existing Gamerscore systems rather than replace them.