I would think the Non-Stop Service is the one that will be able to reach in 55 minutes.

If you look at the Planning Map carefully, the Main Stop from Sgp is at KLIA. KL City Centre is just a Phase One Stop, being equal to an Inter-City Stop.

Hence, first effect may fall on properties surrounding Cyberjaya and Putrajaya.

I wonder where will the Main Stop be located in Penang for this Non-Stop Service.

Anything can happen in 5 years - so, just be careful before taking any proactive actions.