"With a purposefuil grimace and a terrible sound..."
When's the last time? Right now.
Both new highlighting features work, yes. Here's what doesn't:
-- HTML Preview is not available - and I use it a lot, so I invoke IE to come to the Zone.
-- "Save to clipboard" is not available.
-- The bottom frame that contains the extra TOC link, and the "Reload", "Earlier" and "Later " buttons where applicable, load and appear normal (that is, as they do in IE) until the TOC (or a post) finishes loading. It disappears instantantly when the page is complete.
In other words, very much like how Nexus (mis)behaved for Netscape users when first introduced.