Definitely in the works, that's no secret, what seems to be a secret is the exact timeline. But IPv6 development is taking place across all products, not just MX. I too am hoping for this calendar year on the MX. IPv6 already works in passthrough mode and on the LAN side for link-local addresses which is not particularly useful, but no idea yet on new v6 abilities on the MX in 15 firmware or beyond. We have an internal meeting and training event next week and I'm hoping we'll hear some updates there and have some indication on time frame.
