Banknote Questions

Good morning Banknote World!
Anyone know the answers to the following questions?

When is the release date for the new Bank of England polymer 20 pound note?

Why did Australia issue the new $50 note before the $20? When will it be made?

Is Canada going all vertical on their new banknotes or is the new $10 simply a commemorative one-time issue?

thanks

Verweis : "HerMajestyQE2"​​When is the release date for the new Bank of England polymer 20 pound note?

https://www.bankofengland.co.uk/banknotes/polymer-20-pound-note
'We will issue our new £20 note in the first half of 2020'