Xiaomi will start beta testing the Redmi Note 3 Marshmallow build in the near future. In fact - according to MIUI's operations manager, who goes by @RanGer on Weibo - the testing was supposed to begin earlier this week, but was postponed following some last minute issues. What's worth mentioning here is that @RanGer was only talking about the Snapdragon variant of the handset, with no mention of the phone's MediaTek version in his post. This could possibly mean that either the MediaTek variant won't be getting the Marshmallow update (less likely) or it will get the update but not as...
Source: http://www.gsmarena.com/beta_testing_for_xiaomi_redmi_note_3s_marshmallow_build_expected_to_begin_soon-news-20150.php