August 27 update
On the official Overwatch forum, Scott Mercer — senior designer at Blizzard Entertainment — gave some details about the Role Queue Beta. In the first release,, there was every reason to believe that the results of this Beta would not be used later in the calculation of your MMR. If they will not appear in your profile and career, they will be used by matchmaking systems for Season 18.
As announced a few days ago, Season 17 Overwatch stopped "suddenly" — 18 days before the theoretical end to be precise, seasons lasting about 45 days. If this decision had not been explained immediately, the reasons were explained by Blizzard. In concrete terms, Season 18 will only start on September 1 and the two weeks before this date are used as the "beta phase" of the Role Queue (or 2-2-2).
This official post also specifies some important data concerning the performances achieved by the players during these two weeks:




