KLIA2 is going to be referred to as LCCT2 by AirAsia in future. (Not to be confused with LCCT.)
AirAsia today announces that it will launch a campaign to promote the budget terminal KLIA2 as Low-Cost Carrier
Terminal 2 (LCCT2), reinforcing Kuala Lumpur's position as the leading low-cost gateway to Asia and beyond. …
See article
Updated 04/07/16: AirAsia will refer to KLIA2 as LCCT KL - details here
And how will the airport call itself going forward?
"I urge MAHB to stop denying the fact that it is a low-cost hub."
I guess the airport doesn't exactly see things eye to eye with Air Asia