Well yes, but the release date is just conceptual isn’t it, what you need is the date you’ll be able to get your hands on it, which is still TBC.
Although actually that’s not quite true:
Shifter – TBC: £86
Rear mech – TBC: £178
Chainset – some permutations in stock (BB30 170mm cranks), others TBC: £157 – £189
Brakes – 5th October: £305 each
Chain rings – some in stock, others due 29th September
Chains in stock
So brakes are the stopping point (pun intended), unless you can find an alternative source.
Rear mech not compatible with 10 speed, but compatible with XX1 I
believe, why you’d bother though, not sure?