Concentrate on windows.
Early (3.9x), another radical release (3.90 was fairly radical) that implements all the tough stuff, like REAL8 or double precision numbers; and comparision operators (< etc) that return logical results (1 or 0) and can be used in expressions.
Thereafter, concentrate on stabilisation and "cosmetic" changes (adding things like NOT, FOREACH list() WHERE exp, and etc, to get the language obviously offering (rather than indirectly offering) functionality seen elsewhere.
The Magic version 4 is released. This release is Royalty!
Then, with that to work from, linux et al get converted.

PB is great! Let's make it greater still!