Glad to see you here, @torgeirl! Thanks for stepping up to ask this question. Really appreciate the callout and your feedback about how changes to Discourse are announced here on meta. We don’t always get the messaging perfect. Sorry about that!
You shouldn’t have to check the news here on meta to keep up to date with the most significant changes impacting your site. We also have the “What’s new” feed in the admin interface, and as site admin you should be getting a 
notification when there has been an improvement we think you need to know about. I really suggest you read those (and click through when there’s a read more link).
The what’s new feed is tied to versions as well so you will only see the ones that affect the version you are on. Our hosting customers don’t need to worry about this but if you are self-hosting you may want to update more regularly so you get the latest functionality and don’t get surprised with lots of changes at once. Totally up to you of course. Personally I update my self-hosted site every day because I’m obsessed 
but others wait a week or two to make sure any new issues are ironed out before they update. The most egregious bugs tend to be reported and fixed in that timeframe.
I checked and do see that we announced the new rich text editor in July but the what’s new blurb did not explicitly say that that it was rolled out as the default editor for everyone. If you had clicked through to the announcement and read it until the end, you would have seen that it is the new default.
In case you missed it, since that announcement was made, we added a new setting that lets you determine the default editor for your site.