If you are upgrading from release 1.0.0RC6 or up you DO NOT need a dump/reload.
Upgrading from older releases requires a dump/reload. See the upgrading chapter for more informations.

BUGFIX in 3d computation of lenght_spheroid()
BUGFIX in join selectivity estimator

BUGFIX in shp2pgql escape functions
better support for concurrent postgis in multiple schemas
documentation fixes
jdbc2: compile with "-target 1.2 -source 1.2" by default
NEW -k switch for pgsql2shp
NEW support for custom createdb options in postgis_restore.pl
BUGFIX in pgsql2shp attribute names unicity enforcement
BUGFIX in Paris projections definitions
postgis_restore.pl cleanups