Starting with Ubuntu 9.10
(and beginning with tomorrow's daily CD builds), GRUB2 will be the default boot-loader on new Ubuntu installations. GRUB2 will bring internationalization support, support for newer systems, and many other improvements considering this GNU boot-loader has been in development for a number of years.
This change was announced today on the Ubuntu development list
after discussions took place recently at the Ubuntu Developer Summit. More on Ubuntu's GRUB2 implementation can be found via their kernel team Wiki