Dinnerbone mentions that maybe next week there will be a 1.12.1 snapshot containing a small number of bug fixes for Minecraft 1.12.
Dinnerbone also mentions that snapshots for Minecraft 1.13 will start when "...we're confident that we can play for more than 5 mins without yelling "it's broken!"" and that Minecraft 1.13 is "...a technical update, lots of things to make the game run better and let us develop more stuff easier." which will include changes that allow Minecraft to evolve more: "...that's not possible until we remove the block ID limit, which will also be happening in 1.13."
As part of the upcoming Better Together Update, Mojang and Microsoft are working to improve player safety and this week published a guide to remaining safe online, including an overview of the changes coming as part of the update.