Yesterday above company "firmed" its order for 2 A389 for delivery in 2013-2014 at the cost of 655M EUR.
Currently their competition flies 744 with 550 pax to RUN and MRU at about 350 EUR return from TLS, ORY, etc.
I guess with 840 pax they could make the cost fall to about 250 EUR for the 10h 30min trip.
And they plan to use it "extensively on their high density Paris route"
Guess Air Mauritius will have to fold in 3 years... or fly the 343 in full bizz cofiguration...