The two way mirrors

[melhersheybar]

No: HPFGUIDX 155520

I was rereading some of JK's answers to questions on her website, and 
in her discussion about why Harry never used the two way mirrors from 
Sirius to confirm if whether he was at the MoM, she stated that she 
could not tell us everything about the mirrors because they were 
important to books 6 and 7.  I think she actually said something to 
the effect that they were both more less important than they appeared, 
but also would be more important than they seemed, to the last two 
books.  

Question - I don't recall anything in book 6 regarding the mirrors or 
their importance.  Do you think they will make an appearance in book 7?

Mel