The developers are not finding clear and explicit complaints about subdomains no longer working in WordPress Multisite 3.5. Please share anecdotes and data in this thread.
I run multiple Websites on several server accounts. Some of these sites are configured as WordPress Multisite Networks using subdomains (aaa.example.com, bbb.example.com, ccc.example.com, etc.).
Every installation still using WordPress 3.4.2 is still working fine.
Yesterday I upgraded 1 installation to WordPress 3.5 and the subdomain capability stopped working. In my case, the subdomain simply vanishes off the map with a failure to resolve the DNS (which worked properly just before the upgrade).
NO CHANGES MADE TO .HTACCESS.
NO CHANGES MADE TO PHP.
NO CHANGES MADE TO DNS table.
The Wildcard subdomain is properly defined. On this particular server there is another installation of 3.4.2 that is still properly serving subdomains.
I have filed a ticket here: