Honestly, not sure. Jhin is about getting as much burst as possible into one attack and getting as much AD as possible. CDR is another big stat for him.

IE increases his AD by a good bit and gives him critical hit chance. The main reason, however, is of course the big boost in critical hit damage which makes his fourth attack and fourth ultimate bolt very powerful.
Essence Reaver is an obvious pick for it's high AD increase, critical hit chance, and cool down reduction. This will give him most of his CDR needed. This will also allow him to sustain his mana.
Trinity Force is something Im still testing, but Jhin gets more base attack damage than the average ADC (about 0.5 more per level) and Jhin is one of the few champions in the game to be able to make use of every single one of Trinity Force's stats to a decent degree. You will be getting majority of Trinity procs from in-combat W and Es.
Phantom Dancer is your defensive item that you replace your Ionian Boots with once you have gotten enough CDR for them not to be needed anymore, not to mention the reduced cool down on Summoner Spells is more useful to you early game. Anyways, the reduced damage and bonus to kiting Phantom Dancer gives is always great to have, not to mention it is a decent boost to your AD due to the large amount of critical hit chance and attack speed it gives.
Rapid Firecannon is another good item since it increases your burst by a lot, but the main reason is the safety it provides by increasing your range. It also serves the same purpose of Phantom when it provides a lot of AD through AS and Crit Chance.
Lord's is what I call the Finishing Bow or whatever the saying is. It ties the whole build together by giving you bonus armor penetration for tankier targets as well as giving you % boost damage for those Super Tanks.
NOTE: I find it very likely that at least one of these items will be replaced with the new Assassin Dagger that is coming out since Jhin can make decent use of it.
As far as build path, Trinity into Essence is not a bad start since Infinity Edge is mainly just an amazing luxury item. Infinity Edge is required at the latest as third item though due to how amazing it is.