So, we need to make sure that JBT and JBDS BYOE CR1 are installable on Mars.0.Because of the Jetty 9.2.10 vs 9.2.13 issues we had, checking installation isn't enough; please also make sure you test some basic browsersim/cordovasim/livereload scenario on Mars.0 + JBT 4.3.0.CR1.
Len, I don't know if you test JBT on Mars.0 or some Mars.1 RC* but be aware of this situation.