I'm putting a lot on ArcBlock. It's about as strong a project as ICON. It's going to have 500mln marketcap at least, so with 40-ish mln ICO it's a 10x.
Is he still on the ICO, or is he already trading on an exchange? Where can I buy it now?

It's still on ICO or, rather, private sale starts tomorrow. Check out their partners list, it's very impressive. Hyperledger are very storng name in crypto world.