1. Top Lane
The top lane right now revolves mostly around Champions that can properly scale and abuse the new items. Every Top laner is a hidden gem but some are better than others.

2. Jungle
Assassin items have been very welcomed by most of the Champions in the Jungle but those aren't the only ones doing good. AP and Bruisers are also doing great since the new items added a lot of layers to each Champion.

3. Mid Lane
If you notice the best Champions, you will find mostly Assassins, and that is because they have taken over the Mid Lane. Mages take a long time to come online and since they are squishy by nature, it's very easy for assassins to abuse them.

4. ADC
Not a lot of changes to the ADC's per se but the New Items have been going extremely well on some champions, hence making them stronger than the mass.

5. Support
It's fair to say that the reworked Support items have been a great success. There is more creativity in the role now and some items are bound to be more broken than others, and that's the case with some Supports who can abuse those new items with more ease.
