Not sure if this was already discussed, but went on the Jetstar site to find that it had been updated recently.
Looks pretty sleek and user friendly. The booking experience is basically the same as before, just a little more picturesque.
I'm thinking the general site may have a few bugs as it's new. When I was checking out one-way flights earlier it seemed to not want to go to the search screen, but worked fine with return flights.
Anyways, screenshot attached:
