If it successfully launches, it will be the most complicated dApp to ever launch on Ethereum (kudos to @joeykrug and the team).
1. Decentralized oracle with multiple rounds of dispute resolution
2. On-chain order creation, matching, and redemptions
3. Staking
4. Forking is natively built into the protocol in cases of large-enough disputes
Complicated = increase in gas consumption
Eth block are essentially at capacity at 8m gas per block (blocks are close to 100% capacity according to @ETHGasStation) ... so with not that much “demand” Ethereum is close to capacity at the moment.
To create an order costs ~500k gas.
To fill an order ~ 800k gas, etc.
Source: Augur github