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:
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.