Originally Posted by Yora0
The white dot is the new loading bar.
well, not exactly, it's more to do with recent updates to plymouth (it replaced RHGB a couple of years ago afaik) and GRUB2 making graphical boot available to more systems, the blue bar is a "text mode" fallback for when GRUB2 can't start graphics some reason (driver, DRM, etc.)
other plymouth themes are available, but His Meatiness graces all of my fedora boxen with his boot-up blessing. as it was written: the mustard indicates progress.