Among the notable feature is the usage of Systemd!
Quoting the release page;
After almost 24 months of constant development the Debian project is proud to present its new stable version 8 (code name Jessie), which will be supported for the next 5 years thanks to the combined work of the Debian Security team and of the Debian Long Term Support team.
Jessie ships with a new default init system, systemd. The systemd suite provides many exciting features such as faster boot times, cgroups for services, and the possibility of isolating part of the services. The sysvinit init system is still available in Jessie.
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