I haven't received the email, but a mate mentioned it this morning although he only mentioned a charge for seats towards the front of the aircraft.
From the website, it seems they'll also charge for pairs of seats too. Presumably that'll be upper deck on the 2 Class A380s and all the B777s.
Oops - just noticed it specifically says this on the website. Was reading too quick.
https://www.emirates.com/uk/english/...eat-selection/