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someone to get a reasonably definitive answer on this question?
you would get that only from a copyright layer... and definitive answer only from a judge ;)
I don't see how Pharo bootstrap changes anything. If you mean that you can now add library after bootstrap... well you can do that now already with any previous Pharo version.
GPL is viral infection, so if you decide to bundle Pharo with your GPL-ed code, then the whole package will be terminally infected, including all the source code. Pharo or any other loaded libraries in the distro will be considered as GPL. Pharo is under MIT, so you can sublicense it, however if someone decided to contribute some code to your distribution (even if it was to Pharo), the contribution would be considered GPL and only the author would be able to put it to Pharo under the original MIT license.
If you are wondering whether you can distribute Pharo with GPL code linked to it and keep the rest MIT, then the answer is no (and GPL v3 is particularly anal about this, as people are trying to work around it with v2). This is the reason why LGPL exists. LGPL is not contagious.
But again, I don't see how Pharo bootstrap changes any of this.
Peter