Prepare yourselves...
http://cdn.meme.am/instances2/500x/4051117.jpg
REFERENCE: http://www.surrenderat20.net/2016/01/128-pbe-update.html
"Zed Death Mark (R): "pop" damage lowered to 25/35/45% from 30/40/50%"
Mind you, though, its only an air client change. We may or may not see it actually take place.
player myself (UNRANKED SCRUB WHOOO!) i would LOVE doubling down on the pop damage. So Duskblade of Draktharr and Zed Death Mark pop sounds really good imho. So I would adjust my R combo as follows: R W E auto R Q (or something like that). Nightfall passive procs then adds to the damage of the Death Mark. I like it.