The February 2017 issue of Circuit Cellar magazine includes an interview with Eben Upton the head of the Raspberry Pi Foundation.
The key factoid is that they are shipping 300,000 to 400,000 units per month. A possible large audience for Perl and wxPerl.
Are there any RPi/Perl books in the works?
There's never enough time to do it right, but always enough time to do it over...