Operating system: Windows 10
Graphics card: NVIDIA GeForce GT 650M (2GB GDDR5)
DELL 7720 Inspiron
(2.80 , 6a5e8096973 , Branch: blender2.8, 2018-12-07 18:28)
I didn't see that working in any 2.8 Alfa versions of Blender I used. I think it may be an old bug.
Short description of error
When using reference images (Empties) and modeling in wireframe mode the wireframe is not visible (reference images are covering wireframe)
There is X-Ray slider under shading but it doesn't help.
Exact steps for others to reproduce the error
1 Setup Reference images using Empties/Images.
2 Create simple mesh by boxmodeling
3 add SubdivisionSurface modifier
4 Separate parts of the mesh
5 Enter Wireframe display mode or Solid display mode with Shading>Options>X-ray to 0
6 Turn on 'Show whole screen transparent' next to wireframe button
7 Pan/Orbit 3D view to see that wireframe is covered by reference images.
Only when nothing is behind the wireframe it is correctly displayed.
Link to animated GIF showing how it is visible on my PC (You will need to download it... dropbox does not play animaged gifs...:)
If there are any alternatives to see the wireframe of the mesh in front of reference images please write in the response to the ticket. As far as I know background images are removed from 2.8 so users can only use Empty-based reference images.
Thanks for your great work on Blender 2.8 by the way!