I know that WHRP 3 has a lot of haters and it is not a perfect system but if they ever made a new DH I would personally hope that they tried that direction. I think that it would work quit well and with the many flaws with the current rules I would love to see that. I also know that you who might fear this step can breath easily. I do not see FFG do this now or in a distance future! I seen someone on this forums show some cards and art for somethinh like this but have not seen anything lately
Mind experiment: DH with WHRP 3.0 edtion MECHANICS?
I don't have a lot of experience with the WHRP system with all the cards, but the times I did play it, all my fears came true: players started looking at their cards to determine their actions instead of roleplaying.
If ever there was a system/campaign setting that would benefit from cards, rules references and other crunch sheets, it would be Deathwatch, not Dark Heresy. I would applaud good reference cardboards that help keep track of traits, talents, solo modo abilities, squad mode abilities, chapter abilities, skills, oaths, deeds, weapons, ammo, equipment and the myriad of other rules that Deathwatch has.