With the every update it seems comes a new set of wacky changes. This time round is that all '/warp commands are gone, and are gone for the foreseeable future. (correction that includes /lock as well)
On the up side Mystcraft is working and that means link books! so make one for every place you need to be, there will be a link modifier at the spawn house.
That will be the only Mystcraft item that is craftable.
If you see a villager who gives pages, go for it, but they won't be able to make you a world.