PnP Remote Software Repository

• Is there a way to specify a remote server or switch for a new device to download the software image from instead of it always being downloaded from the APIC-EM. This would be similar to Remote Staging in LMS 4.2. As an example, a 3650/3850 IOS-XE image is almost 300MB. 
• It would be great to either be able to leverage the ISR at the site as a repository, or even leverage the first 3650 to be upgraded to serve the image to the rest of the switches.

 Yes!  This is called the remote TFTP server for config and images when you create a PnP project.  You'll see a checkbox for it.  Check the box, then fill in the remote details.  I have used this for a bootstrap app of my own, and it works quite well.  This can be any remote TFTP server.  However, no pre-validation is done to make sure the config and image files exist there.  For your branches, you can create specific projects for them that use the desired remote "stage."