What to do with unclaimed coins has not yet been decided. One proposal from a few weeks ago that UP made internally was that we use it for trying to get some full-time devs, but nothing is decided completely.
Why not just distribute the coins to all stakeholders equally?
There is plenty of coins left for development -- 10% is 400 million Nem plus all the BTC you will have with the auction and first IPO?
Okay, I will help you out.
Proposal 1: distribute refunded stakes equally to all stakeholders (this has to be original stakeholders because it seems to complicated to do this with NXT assets I think?)
It's not complicated with Nxt asset. One token would still be equal to 1 stake, just number of nem in one stake would get larger (depending on unclaimed stakes). It's simply a question of arithmetic and should not be complicated.
Lets say the launch day is August 15th
Everyone will have a chance to create a nem account and claim a stake till August 14. Those who don't would be considered unclaimed stakes. Divide 75% of 4000 billion and distribute it equally among all stakeholder who claimed the stake, including 1 token for 1 stake on Nxt asset
Why do you think 10% plus all the BTC isn't enough for future development? Nxt started with 21 BTC and unclaimed nxt equaled to 10 million ( which is only 1% of total nxt) . There were no development stake.
Nem will have 200 times more BTC (after the auction) and 10 times more nem. I would say that's plenty.