$10,000 Canadian .... that's about six dollars US, right?
I have no idea what the conversion factor is .... so just kidding.
I would wait and get Dura-Ace DI2 12-speed. If I were spending a Really big chunk of money (well, not compared to a car or a house, but for a bike) and I was seriously going for a "dream build:" why would I want to rush into a build and get less than all I could get?
I figure I would rather wait a season for a bike I might have for a few decades (should I live so long) than get the bike a year sooner and listen to people describe how much better they like 12 compared to their old 11-speed set-ups.
It depends on what cassettes Shimano comes out with, but for me the utility of more sequential steps and still a wide useable range coupled with programable shifting ..... so I could set it sequential on one or both rings .....
But I am old and not as impatient as I was when younger. I know for some younger folks, saying "Just wait a year longer" sounds beyond insane.