The test result for the unannounced i5-8269U ultra-low voltage CPU were added to the online benchmark archive on February 16. Compared to the i5-8350U, the i5-8269U has a higher base clock, but the boost clock was not yet revealed.
https://www.notebookcheck.net/Intel-Coffee-Lake-U-Core-i5-8269U-CPU-specs-leaked-in-SiSoftware-Sandra.284694.0.html