Dates haven't been released, it's talked of in terms of RC# or V#. Looking at it from a programmer perspective:
Masternodes = new feature that's never been done
Ring signatures = feature that already exists with code to look at
I2P = feature that already exists with code to look at
Adding those 2 shouldn't be too hard then. I've already asked this, but didn't get a reply.
What are ring signatures, could you post a link to this?