Malaysia Airlines will begin to receive the first of its A350s very shortly. Their website has been updated to include details of the new First Class cabin, together with the seating configuration of the aircraft.
From the looks of it, the new First Class will feature fully enclosed suites. There will only be 4 such seats at the front, arranged in a 1-2-1 configuration.
The seats in Business Class will be similar to the existing one available on their A330 fleet. It also seems that they have refreshed their Economy Class.
Malaysia Airlines will be deploying their new A350s on intra-Asia routes before they debut on the Kuala Lumpur to London route in Jan 2018. I have personally booked both the First and Business Class seats on my short trips to KL and Bangkok respectively. While the hard product looks awesome, I certainly hope that the soft product can exceed my expectations.