WebKit for above 11.02. meaning 11.5x and 12.xx and 13.00 and userland 13.02-13.52.
I'm seeing some posts from people that are seeing information from people that charge to mod consoles.
They claim of webkit on higher firmwares.
Although this is currently possible it's not public so I doubt the claims over there are anything besides premature clickbait to sell you guys stuff.
It is true that a workaround has been found to get the WebKit stuff working on higher firmware and etc. It's still being worked on and isn't published yet.
I don't believe posts of people claiming they've already done it on Facebook and etc.