Video embeds now work on the Kindle Fire's native browser (Android, but modified) so seems good.
However, it doesn't like the mobile theme much. The unread posts section and all the boards are now displayed in a tiny ribbon about 15 characters wide, so stretches for a long time with all those posts. Also, posts are now displayed *under* people's avatars, with a blank space where it used to be before, to the right of the avatar. The new mobile-friendly icons are there, but only take up about a quarter of the infobar/thing.
Generally, it looks like a mobile theme squashed into a desktop theme.
However, the new theme looks pretty good on my iPhone 5, although the titles for threads are still very narrow and don't use all the available space.
Uh..
Did that help? I'm not sure they were very helpful descriptions. I'll see if I can get some pictures if they weren't.
Redacted, Eriaror previously mentioned it as a known bug (and I'm blind or something) so no issues with the new theme then.