It's based on my recent work to support GNU/screen for Debian Installer.
For d-i on normal PC, we can simply press Alt-F2 to get a console almost anytime during install, but it's not easy for some device such as headless server or ARM based board, which usually accessed via serial console or network-console (SSH).
So I spent some time to make GNU/screen ported to Debian Installer .
Now it's almost done, and only wait for 2 packages to be uploaded 
I also made a few local build for a few devices, and asked users to test, the feedback is quite positive .
I'll introduce this work during the short talk and ask for feedback.
And if possible, I can also do some demo after the talk. Thank you!
Talk (20 mins) session with Roger Shimizu during Debconf 16