Quoting willy@infradead.org (willy@infradead.org):
Second, it prompted me to enter the WPA2 passphrase, but it displays
the
password as I typed it instead of masking it with dots the way that it
does for user & root passwords.
This is #768914 and FWIW, I personnaly do not agree with changing the
password phrase prompt to hide the text as typed.
The only idea that comes to my mind is a (low priority) debconf
question before the passphrase prompt, asking users whether they want
the passphrase to be shown as typed or not.