I don't really see to much changing in the jungle. A slight nerf to j4, smites range and the jungling item literally everyone buys? unless I missed something they didn't change to much.
The biggest deal is the loss of ability to change smites. Before A LOT of junglers needed to swap pink smite for blue smite. Blue smite is better at most phases of the game, but you need pink smite to not suck early. You can't do this any more without paying a fairly large tax. That's a big nerf to most non strong junglers (most of the top tier junglers won't care that much).
The smite range nerf is big to the non mobile junglers. Udyr, skarner, voli, etc REALLY care about this nerf. They need that range to gap close. The intended targets of the nerf don't care so much. They have mobility to gap close already, so a bit of range off the top doesn't matter so much. But Udyr losing a third of his gap close range? Yeah, thats big.
Also, pretty much everybody loses 5 AD due to Warriors nerf, except for nidalee.
Jungle was already the least popular role by a fair margin (according to reddit info). Jungle was also the least diverse role by a substantial margin by pretty much any measure that you want to use. 3 nerfs, 2 of which really hit at the lesser junglers is going to be ugly. Really ugly.
Right now Vi and Nidalee are huge, Lee is great if you can play him, J4 is probably still decent (the nerf is bigger than you think - his first clear is going to be REALLY REALLY rough - for reference, I do the necessary 4 camp clear in our organized games at less than 100 health a lot of the time, and he lost a ton of armor late game). Pantheon is still fine since not a lot of this matters to him. After that its getting really ugly real fast.