[Update: Microsoft has released a statement addressing exactly how microtransactions will work in Ryse.
“The progression system in ‘Ryse: Son of Rome’s’ cooperative multiplayer experience offers players the freedom to customize their gladiator with a wide range of armor customization options and upgrades which are accessible across five tiers. Players must advance through each tier by earning experience through gameplay before being eligible to acquire ‘booster packs,’ which contain in-game upgrades.
Once players have reached a new tier, they may either purchase ‘booster packs’ using in-game Gold earned through battle, real-world currency or a mix of both, and then must continue to play to advance to the next tier (there is no way to ‘buy’ your way to the next tier). Players who purchase ‘booster packs’ with real-world currency will only receive a minor boost in how quickly they acquire the items they’ve earned compared to those who only use in-game Gold.”]
"When we talk about the progression system for multiplayer, it's armour-based," the producer stated. "The way that you get armour is very similar to how you get it in like Mass Effect or FIFA. You only earn gold while playing multiplayer [and] you use that gold to buy booster packs. Those booster packs contain random sets of loot. Based on the different tiers of loot that you get -- whether you buy Bronze, Silver or Gold Packs -- guarantees whether you get rare or common items.
Additionally, you can buy stuff using the in-game currency in conjunction with real cash. So if something were to cost 15,000 gold and you only have 10,000 gold, you can make up the difference with real money.
Everything I have seen and played of Ryse just keeps making me question how anyone would be interested in this at all.
Ryse has microtransactions [Videogamer]