That road map was not followed properly. So the SegWit had not come out yet. I am looking forward to the implementation.
Your wrong, final SegWit code was pulled to Github in April as promised (around 19 April).
This mean Core has today 2 and 1/2 months to pull hardfork proposal to 2 MB as two respected Core contributors and Blockstream CEO promised to miners they prepare such hardfork code
within 3 months of Segwit code.
So time is slowly ticking, if they fail to deliver as promised and minners still honouring the agrement, the reputation of these 2 Core contributors and Blockstream become worth very little. The end of Blockstream dominance over Bitcoin development ? We shall see soon if they fail to deliver in time - 2 and 1/2 months to get popcorn ready...