Go to settings -about tablet - build number. Hit build number about 7 times and then it should say "you're one step from being a developer", hit "build number" again and you'll have dev options available again. Why they hid it? Don't know, but it's still there, just an easter egg.
Np. I wish they didn't do that, but then again I can see why they did, not too many people mess around with those settings. We always forget that we on the forums are a very small percentage