There's a small trend towards stainless steel rebar. It's expensive, but is now used for concrete structures near salt water.
Epoxy coated rebar turned out to be a mistake. One scrape in the epoxy and it starts rusting. Exposure to UV prior to installation can damage the epoxy coating. Currently banned in Quebec.[1]
epoxy coated rebar has not been banned in quebec, rather the transportation agency has decided not to allow it in their projects. You are free to use it if you'd like on your own projects. Other provinces still allow it in bridge decks, and you will find the requirements for the materials and material handling/repair in their standard specifications.
Epoxy coated rebar turned out to be a mistake. One scrape in the epoxy and it starts rusting. Exposure to UV prior to installation can damage the epoxy coating. Currently banned in Quebec.[1]
[1] https://news.ycombinator.com/item?id=27676447