Yikes -- first, thanks very much for isolating the PyQt5 bits from the formatting changes. I wish I'd known about the lack of binary packages as I probably wouldn't have even mentioned considering an upgrade if I'd known.

Thanks for making sure to mention that, I think we'll probably just keep an eye out to see if anybody else publishes some premade 2.7 binaries before we upgrade. We definitely want to keep cross-platform support and maintain the relatively easy install process it has now (couple of binary dependencies or apt repository installs) and it looks like PyQt5 doesn't offer a mechanism for us to do that right now.