That is good news about 449.01.
Release cycles are not really planned as the code base is quite mature.
Release 449.01 has been in Edge for a couple years now so that folks like you could experiment.
As you observe, G2core is getting the bulk of the developers focus.
At some point in the future, there will likely be a final (?) tinyG release that includes functionality and capability backported from the G2core base that makes sense for tinyG hardware and compute capability