Yes there was a handful (6 or so?) of test networks—and then they decided to work on a whole bunch more things, ideas ever evolving even in this late stage as it should be to reduce complexity and get as close to the original vision as possible. Those test networks were CLI and so should the next ones. There are updates every Thursday showing which “things/ideas” are [newly] being worked on.
It is not known when the next test networks will be available. But, it hasn’t been discussed specifically in awhile. So while “When will the first beta version be available?” is a question that should never be asked: asking periodically when the next test networks will be available may be able to be answered by one or some of the developers? It may continue to be a case where they periodically go back and forth between 1) test networks and 2) focusing on rewiring/refactoring the code, or both at the same time of course.