Will Steam run on Mint on release?

So Steam is being made firstly for Unbuntu if I understand Gabe correctly.

I get Linux distros share a common kernel (one more behind than the other), and Mint is based on Unbuntu or something I read.

Basically I use Linux Mint because I prefer the cinnamon shell. My question is, if Steam is launched, how long before it's going to run on Mint, natively of course?