As you may know, the SUSE developers have decided to create OpenSUSE Leap version 42, which would change the OpenSUSE system as we know it.
For now, only Milestone 1 has been released, OpenSUSE Leap 42 LTS being scheduled for release in November 2015 and promises to use Kernel 4.1, GNOME 3.16 and KDE 5.
While OpenSUSE Thumbeweed is a rolling release system that adopts bleeding edge technologies fast, Leap is a more stable system, including LTS/ESR and stable apps only.
OpenSUSE Leap 42 Milestone 1 can be downloaded from here and should be tested inside a Virtual machine.