In old versions of Blender, you could easily do a quickshaded render of the viewport animation with the button in the 3D view. I do not see this ability anywhere in the new 2.8 Beta. Even though Eevee renders much quicker than Cycles, it is still too slow for doing this type of Playblast animation preview.
It’s been renamed to “Viewport render” and should be in the same place as before.
It’s in one of the drop-down menus on the viewport.