This page is about migrating GRUB Legacy to GRUB 2.
Initial proposal sent by Otavio: http://lists.debian.org/debian-release/2007/04/msg00328.html
Regressions
lock / password mechanism (patch in http://www.mail-archive.com/grub-devel@gnu.org/msg05350.html)
Menu's default=saved / grub-reboot isn't implemented.
- xen detection / setup in update-grub
Non-regression issues that may become essential (or at least, desirable) during lenny life period
Filesystems haven't been proof-tested with 64-bit offsets (2 TiB disks). Not really a regression (Legacy GRUB has the same problem), but it'll become critical in the future. There's a task for this in upstream: http://savannah.gnu.org/task/?7667