Why is mundo being buffed?

So I just checked s@20, and was scrolling through the usual PBE notes, and saw that Mundo was being buffed http://prntscr.com/cfspmn. Why? I don't like Mundo as a champion personally, but that's just me. But I do think he is a *somewhat* balanced champion. Why the grevious wounds application on his q though? His cleaver already chunks like a mother******. Now its getting a range *and* "damage" (meaning the grevious wounds) buff? That just doesn't make sense to me. Let me know your thoughs
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