Yeah, Chris is right, HTML5 is simply HTML and you can still embed SWF files just as you did older versions. I wish HTML5 would sink to the bottom of the ocean, its worthless! XHTML5 will be way better.
I still prefer flash for certain things. Such as using it to copy a URL to the clipboard without getting a popup warning (what you get when using JS). I recently had to ditch this because it wasn’t support in iOS devices and some Android tablets.