Yes!! It is now Officially confirmed that Asus will working on Android 6.0 for the Second generation of Asus Android Phones.
Asus have recently launched a series of Zenfones that are more powerful in software as well as in hardware so the second generations Zenfone will get Update of Android Marshmallow. Unfortunately Asus First generation phone may not get the update. Its because Asus Zenfone 4/5/6 have hardware limitations. There is no official time-table for the update but it has been mentioned that the Zenfone 2 ZE550kl is under develop and testing.
The following list of devices will get Update to Android 6.0 :
- Zenfone 2 ( ZE550ML / Ze551ML )
- Zenofne 2 Delux / Special Eddition ( ZE551ML )
- Zenfone 2 Laser ( ZE550KG / ZE550KL / ZE500KL / ZE600KL / ZE601KL )
- Zenfone Selfie ( ZD551KL )