Hi Phil,
I'm so sorry to hear about your mother. I offer my sincere condolences on your loss.
In relation to beta testing, keep an eye on the forum. My observation, after having been a forum member for some time now, is that PG Music post a message in forums when they are in need of beta testers. They've done this a number of times over the years.
Earlier this year, they posted such a request seeking beta testers for BIAB 2017 for Mac.
If there is no similar post in relation to BIAB (Windows), I'd take this to mean that they have a full complement for this year's beta testing team.
If you wanted to put your name down with PG Music directly, though, you could always send an email. Also, because the PG Music team keep a watch on these forums, it's more than likely that they are aware of this thread and those who have volunteered as potential beta testers.
By the way, welcome to the forum!
Regards,
Noel