According to my researches, these ICOs will be the hottest in this year:
1. DAOstack
2. Merculet
3. OriginProtocol
4. NEX
I've checked their ideas, teams and advisors, white papers, road maps, softcaps and hardcaps, token metrics - all of these are pretty perspective.
But you should do your own researches to be sure that you want to take part in their ICOs!