1 - 10% premine
2 - minimum mixin of 12 enforced from start of network
3 - emission curve
4 - ?
Are there plans to diverge further, or just continue merging changes from monero?
You can read the Development path here:
https://medium.com/sumokoin/sumokoin-development-path-2c5e0fd1b0fa
Or my summary here:
https://steemit.com/bitcoin/@fiex/sumokoin-one-to-watch
Hope you can find your answers here.
The only two real features I see there - subaddresses and multisig - are fairly long in development and close to use in Monero, so it seems like the answer is just merge stuff that Monero develops?