Yes, DxO have reviewed their own camera. The DxO was released yesterday. DPReview were on hand with a nice hand model. Dx0's review goes so far as to add Dxo One combined RAW file results into their scoring system, effectively bumping the camera's base score of 70 to 85.

In their own words:

“The DxO ONE outputs two different sets of RAW files, which is why there are two different DxOMark sensor results. The first “standard” RAW score of 70 is just above the extremely popular Sony Cyber-shot DSC RX100 III, which achieves a score of 67. The second DxOMark sensor score up to 85 is the result of what DxO refers to as SuperRAW Plus™, which is actually the result of four RAW frames captured in quick succession. DxO Connect software for Mac and PC utilizes Temporal Noise Reduction (TNR) to combine the four RAW files into one new SuperRAW Plus file that DxOMark analyzed.

This article will explain in detail how the use of SuperRAW Plus impacts the DxOMark sensor score of the DxO ONE camera, and how it compares to other cameras, including those with far larger sensors.”

Of course, DxO could have combined four RAW files from the DSC RX100 III, to which the DxO One is directly compared, effectively eliminating the largest differences between the two cameras. But they didn't.

Strange that.