How long will concrete 5.7.x be supported?
You don't HAVE to upgrade to 8.0, but there are a few new neat features available and it will have updates every few weeks/months. Don't expect 5.7 to have updates too, next to version 8.x. This new version is leading. Add-ons from the marketplace will be more towards the new(est) version as well, instead of a more "older" version - which 5.7 just is right now. There are quite a few development changes in 8.0, so developers won't always have a 5.7 and 8.x version available!
Keep these things in mind. Also that 8.x will probably be faster as it will have more and more updates with the lastest available tech.
If someone finds official information about this, please let us all know.
The life cycles of these different versions could be told somewhere. In addition, what they really mean, e.g. will there still be updates to 5.7.x.