The recent work to Plymouth includes various fixes, an improved layout of the help output, and command line parsing support for the Plymouth daemon. Yesterday afternoon support was added to Plymouth for a one-time animation helper and a simple progress sequence helper, both of which will help designers and developers construct new Plymouth boot plug-ins. In fact, Plymouth has now gained a glow plug-in. This plug-in flips through a series of images until the progress reaches 90% completion, and then at that point it runs through the series of images as an animation.
This new Plymouth work -- plus more work we anticipate ahead -- will find its way into Fedora 11. Canonical will also be using Plymouth as a USplash replacement starting with Ubuntu 9.10.