Steps to repro:

1. Create new project in Unity 2018.3;
2. Open Lighting window (Window>Rendering>Lighting Settings);
3. Expand the Lightmapper dropdown in the Lightmapping Settings foldout;
4. Observe the items in the dropdown list.

Expected result:
Progressive CPU and Progressive GPU lightmapper are named as 'Progressive CPU' and 'Progressive GPU (Preview)'.

Actual result:
Progressive CPU Lightmapper is named as 'Progressive'. See attached screesnhot.
Regression introduced in 2018.3.0b4.

Notes:
- Reproducible in 2019.1.0a3 ( lighting/re-expose-GPU-lightmapper) and 2018.3.0b4 (2018.3/staging);
- Not reproducible in 2019.1.0b3 and 2018.3.0b3;
- From the user perspective it would be more convenient to clearly distinguish between Progressive CPU and Progressive GPU lightmappers. Otherwise, it might create confusion;
- Progressive CPU Lightmapped was previously named as 'Progressive' in 2018.2 and earlier before the introduction of the Progressive GPU Lightmapper. This made sense, however now with the introduction of GPU Lightmapper the context has changed.