I seriously doubt John is allowed to publicly disclose upcoming kit releases and timing. However if they are planning a release to coincide with the 50th anniversary of Skylab, it could be a bit of a wait since that won't be until 2023.

I recently built a 1/100 Saturn 1B from the Boyce 'builder's kit' (you need to add body tubes - including the slightly odd sized first stage fuel tubes).
Overall it's a bit better than the 2048 Estes kit, although the capsule/escape tower was a bit disappointing (I replaced it with one from the Estes 1969 Saturn V kit).