Correct me if I'm wrong, but I don't think they said things would be confirmed in wk22, just they won't be confirmed before wk22?
As I understand it you get a confirmed BW approximately 4 weeks before the build. So its unlikely anyone except those being built wk26 or earlier will know yet. Also if you've heard nothing that means you can be pretty sure you are wk27 or later. 
Exactly! The tracking for my dad's GTD went to "confirmed build week" last Thursday, and it was also the day the tracker updated my colour change. As VW UK said my dad's was expected to build week 25 and mine in 26, i'm expecting mine to becme "confirmed build week" towards the end of this week on the tracker. Anyone expecting their build week to be 26 will probably hear this week, 4 weeks ahead of time, and anyone expecting week 24 or 25 has hopefully seen their tracker status change already.
I would expect anyone getting built in week 28 to see it on the tracker in week 24, week 34 to hear on week 30 etc etc.