Back in July we shared Red Hat's intentions to replace RHGB with Plymouth, a new graphical boot process that is able to benefit from the latest Linux graphics capabilities. Red Hat engineers had primarily designed Plymouth around a forthcoming feature we've talked about quite a bit known as kernel mode-setting, which provides end-users with a cleaner and flicker-free boot experience. Today though we are looking at Plymouth and its different plug-ins along with providing a few more videos.
The current version of Plymouth is 0.6.0 and development on this RHGB replacement began in May of 2007 by Red Hat's Ray Strode. However, it wasn't until earlier this year with Fedora 10 that development of Plymouth kicked into full swing. The code to Plymouth is hosted on the FreeDesktop.org git server. As a forewarning, Plymouth is not a solution that can just be built for your distribution of choice, but it must be fully integrated into the distribution. However, once kernel mode-setting is in the mainline Linux kernel, we will hopefully see more distributions use Plymouth or develop their own richer boot programs.
Plymouth has an extensive API that allows artists and programmers to develop graphically rich Plymouth plug-ins. Plymouth is, however, compiled into the system's initial RAM disk (initrd) so there are some limitations. Plug-ins though can rely on loading PNG images as libpng is linked to Plymouth.
More Here