The message from the core devs is a nudge for the Migration Committee to get on the ball and we welcome it.
The roadmap is the Foundation roadmap to support the core development of Catapult, and does not reflect the development. That being said, testing of a new product takes time, and one thing we cannot ever predict, is just how long, if problems arise, it will take to resolve them.
NEM Foundation is working hard behind the scenes prepaing for mainnet. Decisions are made by a Migration Committee made up of Foundation, Ventures, NEM Studios, and Tech Bureau.
Our priority as always is delivering the best product possible, and we will provide an update with the community as soon as we can. Appeciate your patience in this matter.