Alex went to Helsinki recently and presented his SIGGRAPH 2015 talk to the good folks there. Listen as Alex discusses the journey - including the failures - of 'finding' the Dreams engine.
Download: Learning from Failure: a Survey of Promising, Unconventional and Mostly Abandoned Renderers for ‘Dreams PS4’, a Geometrically Dense, Painterly UGC Game PDF (240 MB)
A compressed 34MB version is also available here (although you really should feast on the high res renders if you can!).