I went ahead and uploaded evolution-data-server 3.41.3 to the NEW queue for experimental. The only soname bump was for libcamel which only has evolution and evolution-rss as reverse dependencies.
The evolution 3.42 stable release is scheduled for September 17. So I believe we'll be able to do just one evolution-data-server transition to get unstable all the way to 3.42. Thanks, Jeremy Bicha