NASA is look at a space probe to Uranus or Neptune-Flyby or Orbiter,each one has its good and bad point.A flyby will be the cheaper and fastest way to get to the planet and than after flyby Neptune it could be redirect to a number of KBO object. They pick Neptune because of it has a Pluto size moon with air Triton(more Pluto like) plus the planet itself is very active.
The orbiter would take lots of time to get there maybe 8 years this is because of weight plus a probe to land on Triton with a probe.The interest in going to the these 2 planets is the fact Kepler discover a great number of the exo planet system,plus they are more ice and rock than Jupiter and Saturn are made out of gas.But one thing is stop this cash! Until they get other mission done there is no cash to do this plus the launch rocket isn't done let.Plus the james webb telescope space telescope is take money from other program this is because Congress try to short hand NASA by not giving them the right amount of cash to do it right the first time.One time they did give NASA the cash but they cancel a few mission by not giving the money for the projects,One was a project between the USA and ESA,this left the ESA to regroup and find fund todo it.
Maybe after they get the JWT and the Mars Rover done with.
I would pick a orbiter because the other orbiter has made some great discovery for Jupiter,Saturn,Mars,the moon,asteroid. Cassini spend 11 years around Saturn making discovery after discovery.A orbiter can just stay and pick up details that a flyby miss.
They decide to pick Uranus but to save cash they will used model from past mission,in this case it may look like New Horizon(flyby Pluto). Maybe if approve and funded so far it just study between ESA and NASA.

Or they might do a space probe design just for this mission

This depend on One Thing Cash.This is just for info,no funding.