Merlin Entertainments Group
November 2016 - Ninjago Dark Ride - (7/4/16) Construction on the new Ninjago dark ride at Legoland Malaysia is underway and you can see a picture of the building's framework that is already up by clicking here. They still plan to have it up and ready to open in November.
(11/24/15) According to this article, a third Ninjago dark ride was announced at IAAPA that will be going to LEGOLAND Malaysia. The interactive dark ride will feature a new hand-gesture technology from creator Triotech called Maestro that will allow the riders to fire balls of lightning, fire, ice and more at their ninja enemies on the interactive screens during the dark ride adventure.
The first two Ninjago rides will open at LEGOLAND California and Billund in Spring 2016, while the LEGOLAND Malaysia ride wont open until November 2016.
2017 - Nothing is known at this point in time...
2018 - Aquarium - Planned - (5/15/17) According to the local news Legoland Malaysia will begin construction next week on a new marine life aquarium attraction to open in 2018, with the official announcement to come from Merlin sometime this fall. While at first this could be taken as the clear sign that they will be opening a new Merlin branded SeaLife Aquarium next to the park as a second gated attraction, some of the Legoland theme parks have instead opted to build unique attractions that take guests on a simulated submarine voyage through what is essentially a giant themed aquarium full of live fish species. One named Submarine Adventure just opened at the new Legoland Japan park last month (follow this link to see a video of that attraction) while the Windor park opened similar attractions in 2001 under the Atlantis Submarine Voyage name.
I guess we'll have to wait a bit longer to find out if this is a new ride at the existing park or an entirely new ticketed attraction.