Users can currently download Eevee sample files here - https://www.blender.org/2-8/#try-it-yourself
Due to the ongoing development of Blender 2.8, some of these are broken ( the bones in Tree Creature ), and most of them are using an older UI ( eg the Header is at the bottom ).
It would be great if these could be fixed up and easy to use for new and existing users wanting to check out Eevee as easily as possible.
Having Eevee on by default in these files would be the icing on the cake, but of course that’s not possible ( https://developer.blender.org/T57338 )