The Crowfall site has been updated with a new blog post to talk about changes being made to the Knight Archetype. Among other things, Knights will now use a single resource, with all powers and skills updated to generate and use stamina. A few new skills have been added as well.
Changes are also being made to the blocking mechanic, shield bash and other smaller tweaks. The best news is that the flat 10% damage penalty has been removed from the tankier Knights, though the team will be keeping an eye on the numbers and tweaking them as needed.
You can read the more detailed report on the Crowfall site.