Great list of questions.

As part of migration, a good question would be not just about the TECHNICAL migration, but the migration of existing users' programming practices on to the new platform as well and any issues which arose. A common occurrence I've seen is the reluctance of PC-based programmers to let go of their local copy of SAS in favour of a centralised platform requiring them to use alternate SAS clients like Enterprise Guide (which in itself, is not so much an issue given it's programming capabilities, but then it raises the issue of migrating existing processes which might rely on local "X" commands, local libraries, etc).