The Shibboleth V3.0 SP release is a major version release. This means yada yada yada
We guarantee backwards compability with the most recent V2 version of the SP (2.6.x).
A lot of syntax has been deprecated in V3. As a rule of thumb, if something is documented in this space then it is not deprecated. Otherwise a warning will probably be introduced in the log.
In V3 the default confihuration file name is }