Mostly A330s, A340s (-300 and -500) and B777s (-200s, -200ERs and -300s).
The B777-300ERs will commence installation in May. Eventually the plan is to fit out the entire fleet but this will take at least another 2 years.
From what i can recall they are trying to do 3-4 aircraft per month and the installation is being done as the aircraft go in for scheduled maintenance.
New Boeing deliveries from June/July onwards will have the system pre-installed from the factory.
Rgds
Emirates777