While the number of heroes, maps and cosmetics keeps increasing year after year, Overwatch's competitive mode has remained relatively stagnant. With that in mind, I am very glad to say that Blizzard has finally implemented some nice changes with Season 16!
The first and most important one for the general playerbase is that Blizzard has now completely removed the off-season break. In other words, as soon as a season ends, a brand new one will begin. A relatively simple change in the grand scheme of things, but certainly a welcome one as the lengthy break was always a complete waste of time for players that didn't care much about non-competitive modes.
As for the second change, it is much more impactful, though only for a very small portion of the playerbase. In order to ensure quality matches, as well as prevent matchmaking abuse that happens at the highest ranks, Blizzard has now made it so Grandmaster players can no longer queue for Competitive Play in parties larger than two. While this is likely to end up causing trouble for some people, it's unfortunately something that simply needed to be done given the vast skill disparity between low-GM players and those in Top 500.
While that's pretty much everything as far as the current changes are concerned, there are some nifty things coming in the near future. The Anniversary event is supposed to bring with it something massive, the Havana Escort map is currently being tested on the PTR, while the newly announced Overwatch Workshop promises the ability for players to create their very own game modes and events.
Once some of those new features reach the live servers I'll make sure to let you know, but until then I wish you the best of luck in competitive!