I've constructed a few things in the nether around the portals. Every one there should be completely enclosed now (except one over the lava, it's in-progress). Not every one has a sign saying where they go, but a number of them do. I'll admit to have "hacked" a bit of the materials (creativeland) but given we're nuking it in 1.9, I'm OK with that for "this" nether.
Btw, to whomever constructed the sandstone enclosure (I presume Gas given the co-ordinates), know that sandstone doesn't resist ghast blasts. It's better than sand, but not by much. Now neither does glass (I've used that a bit deliberately) but if you thought it'd be as good as cobblestone, it isn't, so be aware. It will still break line-of-sight so they won't fire on you (even glass does that), but it will go "poof" when a ghast blast comes near.