Today, Asus has announced which of its devices are going to be updated to Android 6.0 Marshmallow, currently the latest version of Google's mobile operating system.
Without further ado, here's what to expect. The PadFone S (PF500KL) and the ZenFone Selfie ZD551KL will get Marshmallow, along with two Zenfone 2 versions (ZE550ML and ZE551ML), the Zenfone 2 Deluxe ZE551ML, and no less than five different iterations of the ZenFone 2 Laser: ZE500KG, ZE500KL, ZE550KL, ZE600KL, and ZE601KL.
That's it, and it's unclear if the Taiwanese company plans to add products to this list at a later date. So perhaps you shouldn't bet on that. Do note that with Asus devices, the model number is very important, as seen above - so before you celebrate that your Asus handset is getting Marshmallow, make sure you have one of the designations listed above. And yes, there are two differently named devices having the same ZE551ML model number, that's not a typo - it's just how confusing Asus likes this whole thing to be.
Absolutely nothing has been said about rollout timing just yet, but that information is supposedly going to be out at some point in the future. Which means you probably shouldn't expect to see Android 6.0 officially running on any of these devices in 2015.