So far, I am loving the update. I can finally use my Chlorophyte Partisan without it feeling OP, Mushroom biomes are now free of Hardmode enemies pre-Hardmode, and the Lihzard Temples remain broken.
Yes, as much as I hate to say it, there are still issues with them. I created a new 1.0.1 world just to check it out. The entire thing had zero traps whatsoever (excluding Wooden Spikes). I deleted that world and made two new ones, only to get the same result on each.
This is obviously a major problem, and I feel it should be corrected before 1.0.1 becomes available in Europe and Australia. Also, if someone with the update can do so, please help me confirm that this is not just a bug on my copy. I play on the New 3DS XL, if that helps any.