Really excited to see when we will be able to set a block template with placeholders for the default post headers. Especially if you could assign different post formats to specific saved block layouts with featured imagery, etc in them. We've been using reusable blocks on our client sites a ton.

I want to see a block template section that you can assign for headers/footers. It can't be that far away at this point. That and post header/footers are the only things that we still use PHP templates for at this point, and it'd be a whole lot more flexible if we could use Gutenberg for universal site elements too.