YouTube introduced mobile livestreams some time ago, but it was only limited to channels with at least 10,000 subscribers. Naturally, this feature was mainly targeted towards large content creators at the time, and wasn't a very good fit for regular users.
It appears that YouTube knows that very well, as the mobile livestreaming test is now being extended to more users, as the subscriber requirements just got a lot lower. Starting today, channel owners with 1,000 or more subscribers can go live on mobile.
This might be a sign that YouTube is looking to brings its livestreaming capabilities to.
Source: http://www.phonearena.com/news/YouTube-is-lowering-requirements-for-mobile-livestreams_id93174
