Micropub 2.2.3 for WordPress has been released. It fixes a variety of warning notices.  Published, updated, name, and summary properties are no longer stored in post meta. When queried, they will be pulled from the equivalent WordPress properties. Content should be as well, however as content in the post includes rendered microformats we need to store the pure version. Might address this in a future version. As timezone is not stored in the WordPress timestamp, store the timezone offset for the post in meta instead of the full published and updated date. It will also sideload and set featured images if featured property is set. Note: Version 8.9 of JetPack apparently breaks this plugin. This is under investigation.
I bumped up a little plugin for my site that generates rewrite URLs for avatar images. So if you visit /avatar/username you get redirected to the avatar for that username. You can add ?s=250 to pass the size to the other side. This is the same query used by Gravatar. Right now, this calls the gravatar URL and does a temporary redirect to it, setting cache control headers to save the redirect. This means that there could be up to two http queries per avatar image. In a future version, I might actually serve the avatar locally. I got tired of broken URLs for my image. Now, the same link will always produce my image.