Kogmaw is the final Juggernaut. The previous Juggernauts were merely to get us ready for him...

Changes:

Bio-Arcane Barrage (W) has been changed to make Kog'Maw some kind of vomit-spewing machine gun while it is active.
  While W is active, Kog'Maw attacks twice as fast, and his Attack Speed cap is doubled to 5 attacks per second.
    While W is active, basic attacks deal reduced physical damage, but apply on-hit effects at full effect.
    During this time, Kog'Maw attacks so fast that attack-moving efficiently becomes incredibly difficult, so choose a time when you don't need to move much, and go to town.
Living Artillery (R) has been repurposed to be less powerful in the average poke case, but very threatening as an execution tool.
    Living Artillery's base damage and ratios have been adjusted, and it no longer deals increased base damage to champions.
    Living Artillery now deals double damage to enemies at 25%-50% current Health, and triple damage to enemies below 25% Health
Various other changes/thoughts:
    Base Attack Speed stats and Q's passive Attack Speed have been adjusted so he is more dependent upon maxing both his Q and W to really approach his full damage potential.
    For those wondering, AP Kog'Maw will play a bit differently than before, but we believe it to be of about equal power to before.

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Well.. His W is the most powerful thing in the game. 6% Max HP on hit, double attack speed buff (allowing him to break the attack speed cap, granting him up to 5 attacks per second), and granting him the longest range in the game (the only trade-off is that his auto-attack AD is reduced to 60% during the duration)? He will literally be a sprinkler of doom just from this one ability (30% max HP per second just from the W alone, not counting the 5 on-hits allowed thanks to his attack speed buff). And then you have his ult, which will deal a base (at lvl 3 of the ability) of 160, but up to 480 if the target is less than 25% health every single second. Move over Garen, your "execution" ult has nothing on this long ranged shit.

Face it, Kog is the ultimate Juggernaut. He is slow, has no true mobility, but does INSANE amounts of damage. With a BOTRK and his W's natural damage alone (on an attack speed build), he will be pumping out 30% Max HP and 5 iterations of 8% current HP PER SECOND; and this isn't counting other on-hit damage + your autoattack damage for the 5 attacks in a single second. With a Runaan's hurricane, he will be able to get up to 15 attacks worth of damage per second out.

And he still has the rest of his kit to help him deal more dmg/slow/NOW LONG RANGE EXECUTE the enemy. He outranges all other ADCs, can do more damage than any other champion in the game, and can take down any tank with ease.

The KOG in Kog'maw now stands for King Of Games, because he truly will be the king of the rift if these changes go through.

GG