Seth, are you planning on keeping this article up to date?

Absolutely, it's not easy to keep things like this up to date but I will try my best. All of the source for the site/posts is on Github as well, so pull requests to correct/keep things up to date are always welcome! The specific source for this post is here:

https://github.com/sethforprivacy/sethforprivacy.com/blob/master/content/posts/proposed-bitcoin-privacy-improvements.md

There's this ring signature proposal for Bitcoin

Will give it a read and add if it makes sense, thanks!

And here seems to be some update for Stealth Addresses

Will give it a read as well and share with Monero researchers to see how relevant it may be, thanks! Had definitely not seen this before, though.