I am currently using a quite old RT template: Enigma. Since I use PostgreSQL for all my websites, I'd like to upgrade my J!2.5 sites to the latest version so I could benefit from the brand new pgsql driver included in the recent J! platform. Everything runs fine, except that template wich can't be installed properly: I stumble upon many Fatal errors due to deprecated classes being strongly use by the template. I guess templates as old as Enigma suffers from the same compatibility issue.
Do you plan to update a certain list of your previous template to be 3.0 friendly? I might join the club back if you do!