The stable release of Ubuntu GNOME 15.04 has arrived and is now available for download. This release Ubuntu GNOME Team include GNOME 3.14 as default desktop environment, powered by Kernel 3.19 and using systemD as default boot manager. Based on Ubuntu 15.04, it will supported with security patches and software updates for only 9 months, until February 2016
Furthermore, gnome-maps and gnome-weather are now installed by default. GNOME Classic session is included. To try it, choose it from the Sessions option on the login screen. Also numix theme is now installed by default. but, there are no new community wallpapers for Ubuntu GNOME 15.04, still using old wallpaper.
For more information, you can refer to Ubuntu GNOME 15.04 release notes