I'm sure Riot has already considered the prospect of giving Rengar extra bonuses now that he no longer loses his passive stacks; before his mediocre sized ability rework.

But anyways, it should/could be just moderate to minor buffs that gets. Not too much but enough to make a real difference almost as much as it does to Kha'Zix.

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The new feature here is that once Head of Kha'Zix is acquired, it won't give Rengar 20 stacks straight away. It will simply replace his Bonetooth Necklace, giving slightly better stats; actually give a unique reward. This means Rengar still has to stack his Bonetooth Necklace to get all bonuses if he hasn't gotten 20 stacks in it yet upon acquiring Head of Kha'Zix.

The point here is not to be give him OP bonuses, but just to give Head of Kha'Zix an actual reward.

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VFX: As an added visual feature, Rengar's blade has a small but noticeable purple tint at the sharp edges of his giant knife and wrist blades.

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For reference here is the wikia page for Rengar's abilities and passives.

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#Head of Kha'Zix Hunter's Domain (3 stacks)

• 30 extra Movement Speed whilst in stealth or brush (5 Movement Speed bonus.)

Unseen Predator (6 stacks)

• Leap range increase by 130. (5 leap range bonus.)

Thrill of the Hunt (12 stacks)

• Duration increase by 7.5 seconds. (1.5 second bonus.)

Thrill of the Hunt (20 stacks)

• Movement speed is doubled and 15% Tenacity. (15% bonus Tenacity.)

Team Rengar