For those who want to embed YouTube videos without "uploading" them to the wiki, you can use the YouTube parser function: {{#youtube: YouTube code}} and it should work as it did with the tags. The videos take a bit longer to load, though.
The YouTube tags will continue to work as they did before if they are smaller than 30 pixels (for audio players, perhaps) and if they are in templates without parameters, apparently.
I'm not sure if we have a page that concerned this, since I didn't even realize what had happened until all pages with videos were just all of a sudden edited, with no announcement whatsoever. 
Random-storykeeper 
21:35, August 13, 2013 (UTC)