I just read in your other post that you lost his momma. I'm so sorry to hear that.
I don't know the significance of the roaning on the legs/belly because foals tend to have pale legs/bellies anyway.
I did hear that chestnut foals are usually born with pink skin and grays, even if they are chestnut, are born with dark skin.
But I won't really guess about what color he is because I am not all that familiar with foal colors, and since his daddy was cremelo, he should be some sort of dilute as well.
The reason I am talking about the difference between gray vs. non-gray is that I had my first-ever foal last year out of my gray mare and he ended up being a gray. So I researched it a lot on the internet (and I slept at a Holiday Inn Express last night!).