I sent an email regarding routes and information on Etihad's Boeing 777 that will recieve and put into service in October this year. This is the reply I got:
The 777-300ER will primarily operate our routes to South Asia and the Far East from Abu Dhabi, and will be configured in Peal and Coral Zones – actual seat plans will be posted on our website shortly. The aircraft will be equipped with our new AVOD, details of which will be announced shortly.
Guest Affairs Department
So it looks like they will fly them to BKK and perhaps HKG, MNL etc. They have five 777-300ERs on order.