Some more changes (although those are as well 2016 so not 100% perfect for this 2015 thread)
Dubai – Ahmedabad eff 25OCT15 Increase from 10 to 11 weekly
Dubai – Birmingham eff 01JAN16 EK041/042 2-class 777-300ER replaces 3-class -300ER (Previously Airline Route did not specify this flight will be served by 3-class aircraft, in the report filed on 22DEC14)
Dubai – Kuala Lumpur eff 01JAN16 EK342/343 Boeing 777-300ER replaces -300
Dubai – Male – Colombo eff 01DEC15 EK652/653 Boeing 777-300ER replaces -300
Dubai – Tehran eff 01JAN15 EK975/976 Day 25 Boeing 777-300ER replaces -200 (Daily 777-300ER as a result, instead of 5 weekly -300ER and 2 weekly -200)
http://airlineroute.net/2015/01/23/ek-w15update2/
Looks like that B777-300 will go next.