Changes from 1.2.5 to 1.4 pre-alpha?

I've been away from Django for over 6 months. Previously I was using
1.2.5. Now I'll be using 1.4 pre-alpha.

Can someone please point me to a good summary of the main changes made
between these two versions?

I've noticed that some of my projects no longer run, reporting
(a) ADMIN_MEDIA_PREFIX deprecation warnings and
(b) "Error importing template source loader" ImproperlyConfigured
exceptions.

Many thanks.

Rodney

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