Thank you. I'm very happy to read your response as I have two Scarlet Oaks (about 2" caliper as I planted them in 2013) as well. Beautiful trees--perhaps my favorite--and good for screening as they retain their leaves all winter when nearly every other tree in Michigan has no leaves. The diversity of when leaves color up is key for me. My Scarlet Oaks are already a deep...scarlet color of course. My goal is to surround them with a true red fall color tree and I think the one I saw today is that type of tree. I just wish I knew what tree it is.

It's not a straight red maple since the leaf shape is wrong for straight red maple. It's one of the hybrids with red, probably Acer freemanii, a cross between red (gives the leaf color) and silver (gives the leaf shape).

Good choice in trees! If you are going for tree diversity and Fall color, why not throw in a sugar maple?

Sugar Maples are nice, but I'll push that out a year or two. Right now I am just targeting a solid red fall color leaf. Aside from an Autumn Blaze, can the tree in the photo be another variety?

definitely looks like an Autumn Blaze

I would agree with it being an Autumn Blaze maple:

Google Images leaf pics