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Blizzard revealed some of the changes they have in store for the third season of Competitive Play in Overwatch. It's important to note that the currently ongoing second season will conclude on November 24. The third season will begin on December 1.

Designer Scott Mercer provides the details on how competitive ranks will be handled come December.
Another area of Competitive Play we’re trying to improve for Season 2 is how we distribute everybody into their Skill Tiers (Bronze, Silver, Gold, Platinum, etc.) based on their SR. When Season 2 started, we had WAY more players in Gold and Platinum than we initially intended, and way fewer in Bronze and Silver. This was the result of how we calculated your initial SR for Season 2. We tried to partially reset player SR at the start of Season 2, but the results were not as we expected. Instead, below-average players started Season 2 at a higher SR than they should have been given their performance in Season 1. This meant that as they played in Season 2, their SR would often drop to a lower value, which didn’t feel great. It also meant that there was a much wider variation of skill in the Gold and Platinum tiers than we wanted. This is something we want to avoid in Season 3.

As a result, we’re testing a different way of determining your starting SR for Season 3 on the PTR. We’re leaning more towards trying to keep things fair rather than giving everyone a fresh start. We’re also going to initially tune your SR to be slightly lower to start. In turn, fewer players should start the season having their Skill Rating drastically drop despite having close to even wins and losses.

This change will mean that some players will not start in the same tier for Season 3 that they were placed in for Season 2, and that your SR gains from winning will be a little higher at the beginning of the season. After you play enough matches, however, your SR gains and losses will go back to normal.

That sounds like a good start to Season 3. If you want to hear this straight from the source, look no further than Battle.net.