...
The master branches have been moved to a new parent POM based on Java 8 and Spring 5 as the first "step forward" and all but a couple of tests are passing and it the IdP seems to be functional, so that's a good sign that we won't have too much remediation needed. Eventually this will be moved to Java 11, but right now the Maven toolchain isn't stable on Java 11, so we're on Java 8 for now.
We also have a buildable artifact containing a curated and well-organized Jetty 9.4 configuration that works with the IdP with minimal adjustments and will probably make that available in some capacity, with an eye towards including it in V4 to help bootstrap new installs (assuming 9.4 is a current release at that point in time).
What isn't really decided at this stage is what the schedule and scope of V4 will be, with the most likely options being a 12 month development cycle with minimal feature additions vs. a longer cycle of perhaps 24 months to accomodate more new features. Both options are possible and make some sense, and hopefully we'll be able to engage people on this question once we have some initial discussions with the Board about it. Regardless of the decision, we don't expect the upgrade process to V4 to be onerous, though we can definitely promise there won't be a supported path to upgrade from V2 directly to V4.
...