Hi John,
Yes it will be published, however not yet. We’ve had a company decision that the time in between the customer release and the open source release was extended to 24 months. For customers, the sources are already available along with the artifacts from Maven repo.
Next update on GitHub should be in July for 15.3
This has been communicated to customers already last year but it isn’t so clear on that page. I’ll see if that can be updated.