From the Release Notes:
“This is Linux Mint 4.0, codename Daryna, based on Celena and
compatible with Ubuntu Gutsy and its repositories.“Daryna is using Gutsy’s package base (kernel 2.6.22, Gnome
2.20, OpenOffice 2.3, Thunderbird 2.0…etc)…“With mintUpdate you can now get automatic updates without
compromising the stability of your system. Updates are assigned a
security level which indicates how safe they are for you to apply.
MintUpdate also brings you more information about the updates and
the risks involved in applying them…”