The W3C has updated four recommendations:
The new editions just incorporate various errata. I skimmed the changes. Most of them don't look too serious or likely to cause problems. There is one nasty one (rewriting history to put the xmlns prefix in a namespace) but that's been a problem for a long time. Moving that decision from the errata page to the core spec doesn't really change anything. If anything, it's more honest since we can now specify tools as supporting the first or second edition of Namespaces in XML rather than pretending there's really only one variant.
