Terms announced here https://medium.com/nimiq-network/nimiq-network-token-sale-terms-9af2e7fd6228

Selling 5% of total tokens, cap of 60,000 ETH (subject to change up to 24 June with ETH price changes). 88% of NIM will be mined, the rest distributed to team etc.

21 Million NIM, ICO price roughly $20 per NIM

ICO tokens represent 24.5% of circulating NIM supply after one year, so Market cap after one year around $80 million at ICO price.

I can't see any details of what happens to any unsold tokens.