I will shortly be starting a new project and was hoping to use Bootstrap 4. The problem is that a big component of the Bootstrap value proposition is the themes

I will shortly be starting a new project and was hoping to use Bootstrap 4. The problem is that a big component of the Bootstrap value proposition is the themes and controls - both commercial and open source. And the frameworks are built on top of these themes and controls. It will likely be many months before this long dependency chain has migrated to V4.