a book about Photolab 4 is announced. However in German:
DxO PhotoLab 4 - The comprehensive practical book (German) Paperback - January 19, 2021
by Michael Gradias.
From the content:
New work feeling in the DxO Smart Workspace Large arsenal of creative tools The spectacular AI solution DeepPRIME DxO ClearView Plus for more liveliness Simulation of gradient filters Targeted access to correction parameters DxO Smart Lighting for more details RAW conversion and batch processing Anti-moiré against unsightly artifacts Professional presets with a big impact Repair tools for retouching Efficient optical corrections Direct file access and keyword assignment The optimized asset management Photos with watermark or logo How to manage your photos efficiently
(Translated with google translator)