Is there some commitment on maintenance of old versions? e.g. is 1.x still supported with security updates? will it continue to be supported now that 2.x is out, and for how long?
Yes we are transitioning away from latest track and will be putting the old stable into 1/stable for archive purposes. Then 2/stable will be new LTS and 3/stable will be for new development releases and will become the next LTS.
I’d suggest getting those tracks set up ASAP so everything’s in place for the new versions. It’ll make things easier when the feature releases start rolling in for 3.x.