Android 6.0 "Marshmallow" is a version of the Android mobile operating system. First unveiled in May 2015 at Google I/O under the codename "Android 'M'", it was officially released in October 2015.
As we know ASUS already planned their Marshmallow updates for zenfone series including ZenFone 2 ZE551ML and ZE550ML, ZenFone 2 Laser, ZenFone Zoom, for full smartphone that will be update to Android 6.0 Marshmallow can be see Here.
The company is currently looking for people to beta test the Android 6.0 Marshmallow for ZenFone 2 (ZE551ML and ZE550ML), ZenFone 2 Laser (ZE500KL, ZE550KL, and ZE601KL), and ZenFone Zoom (ZX551ML). There are some prerequisites before you can apply, though. First off, you must have ZenFone with TW/Taiwan firmware, and apply via ZenTalk (ASUS official zenfone forum), and provide IMEI+Serial number to ASUS at their beta thread. The beta test program is end at the end of february.
Here is some screenshot from zentalk TW forum
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| ZenFone Zoom Marshmallow Beta Test |
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| ZenFone 2 Marshmallow Beta Test |
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| ZenFone 2 Laser Marshmallow Beta Test |
source: http://www.asus.com/zentalk/tw
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