That would have been great to know before I flew around for ever. So is there anyway to get to Rheinland from Liberty now? If not do the devs plan on explaining why in RP? I'm seeing a lot of changes and most of them aren't really listed anywhere.
The system design MO has been discussed in various places for quite some time, and that ideal is reduction. Also bear in mind that Jump Holes are not permanently stable, and can shift.
You may also find the Freelancer Companion tool to be of significant aid when exploring systems
You can find the JH to New Hampshire somewhere in the top middle of the map in Minnesota, I cannot recall the exact coordinates but somewhere around the D 2 area with a battleship sitting near it. Beware, the NPCs in NH are brutal and spawn very quickly once you get away from the jump hole area, so expect half a dozen gunboats and some cruisers to be after you pretty fast.