Hey there, how can this new function be used?

I don't understand the question. Could you rephrase it (and I can delete this post)

I think he wants to know the added value of the text when someone resets/changes their password.

Theymos' post can be found here: https://bitcointalk.org/index.php?topic=827927.0

This should make it easier to determine whether an account has been compromised.

Alright, thanks for the explanation, somehow I overlooked his post.