The Quantum Theme for bbPress has been updated to version 1.6, with many bug fixes, updates related to GD bbPress Toolbox Pro, many more styling improvements and one more theme colour style.
This version improves support for the GD bbPress Toolbox Pro specific features and adds extra styling for some elements. I recommend updating GD bbPress Toolbox Pro to the new version (5.8.3 was just released) because it adds a few more Quantum Theme related templates.
Work has begun for version 2.0, that will be released next month. In the past few months, I received a lot of suggestions and, most of them will be implemented in the next major plugin version. It will include many improvements to main SCSS files to allow for better flexibility when it comes to colours and other parameters. Finally, the plugin will have customizer options for selecting any colour for various elements, making it even easier to customize and integrate into different themes.