These went up at 10:30 while I was in a team meeting and they're still up at the time of this message. Smyths seems to be getting stock added intermittently too, seems like those reports of there being ample stock available is true – just seems like it's being rolled out in waves, which is the smart thing from a business perspective (limits potential reach of scalpers, creates scarcity, etc.).
Links to the Argos pre-orders for those curious (standalone, Mario Kart World bundle)
Just hope the same holds true for the GameCube controller with it being a Nintendo Store exclusive and all, fingers crossed!
Glad to hear you got your order in too @S.C.G