It's currently testing for a very small percentage of users. (mashable.com)
The OTA is incremental, meaning it will reach a «small percentage of users today» before a broader rollout begins «in a few days.» (pocketnow.com)
While Facebook is known for testing changes on small percentages of its user base, Krieger and company prefer to get new elements as close to perfect as possible before rolling them out. (inc.com)