Welcome aboard.
There's a thread over at dvdtalk.com that charts titles going out of print, so such information shouldn't be too hard to come by. There really isn't much Fox can do except repackage their current releases timed to the new film, *if* they retain the home video rights through 2015.
The trilogy sets with the DVD combos came out just a year or two ago, IIRC?
I imagine lots of things are out of stock right after Christmas though.