I was really hoping to find a way to do this but after digging quite a bit and searching around, I’m not seeing a great solution. I’ve wanted to simply set up two virtual cameras and manually be able to blend from camera A to camera B via a blend value T. If this is possible and someone can explain the means of achieving it. I would greatly appreciate it. If not, it seems like it would be a very useful addition.
Yes, with CM 2.1, available here: CM v2.1 Release Candidate
Main menu: Cinemachine/Create Mixing Camera. This creates a virtual camera whose output is a continuous blend of up to 8 vcam children. You drive the blend weights.