This would be awesome in conjunction with a right hand column, which could be used for dynamic (tho mostly cached) content such as:
It could also be used for static info, such as links to frequently asked questions, info for newbies, events that may be going on, pinned threads, links to about page etc. It would make the homepage more of a homepage imo
On the site in the image above, we start that col with a randomly chosen picture from the member galleries, and end it with some small banners for our sister sites. It also includes a ‘latest threads’ block though obviously that wouldn’t be need on Discourse. The possibilities are endless.
Currently without something like this the page looks somewhat barren - which makes me think you were planning something like this anyway
Edit: Can we keep the same category ‘box’ style in this new position too btw? I hope so.