Well I did my Warwick jungle and it was simple as pie.
AP Quints, Mpen Reds, Armor Yellows, and MR/lvl blues
I went with a 9/12/9 route for masteries. 9 point in o tree to get the spell pen, 9 points in utility for runic mastery, and rest in defense.
I started the game like normal and was going to just get a machete. Nik was on vent and saying adamantly that I should also buy 5 potions. I never needed to buy any potions with WW previously. Usually I'd just buy boots and leave it at that. Save the initial cash so I can get some better items faster. Well I caved in and bought 3 because he kept saying the jungle was that much harder.
So the verdict? The jungle is cake for WW in the setup I ran. Didn't need to use a single potion and stayed full health the entire way through the first trip. Seriously the jungle has always been easy for Warwick and that hasn't changed.
I go Q, W, Q, W, E, R for my initial ability picking. Don't lead off with Q, get a few hits on you when you start a camp and use Q to top off.
Still trying to find the right build I want for him. Before I would go Ionic Spark, Wits End, and Merc Treads as my core items. From there it was the defensive items I would need. Warwick didn't need to be built for damage, just to be tanky enough to survive his intial ult jump in team fights. Warwick is usually HEAVILY focused for some reason and having a decent amount of mitigation is key with him. Spirit visage, Frozen Heart, and Guardian Angel were all great items I would usually round out my build for him with.
Now, I'm trying to figure out a similar optimal build I like for him.