While the CPU performance increase seems negligible on the new Ryzen 7 5700U models, the results mustered by the iGPU side certainly suggest that the Lucienne APUs could integrate Vega 11 chips, at least for the top-of-the-line models. These Lucienne APUs could be AMD's rushed response to Intel's Tiger Lake models that are just a bit faster than the previous AMD Renoir processors.
https://www.notebookcheck.net/Renoir-refresh-incoming-AMD-Ryzen-7-5700U-APU-spotted-in-Ashes-of-the-Singularity-benchmark-could-feature-Vega-11-iGPU.495161.0.html