2.15.2 (unstable):

Glib:

* Checksum: New class, wrapping GChecksum.
  (Naveen Verma. Bug #510235)
* ObjectBase: Added connect_property_changed_with_return() 
  because connect_property_changed() does not return a sigc::connection.
  Bug #433984 (Philip Langdale, Kalle Vahlman).
* enums.pl .defs generator: Handle parantheses.
  (Marko Anastasov. Bug #498621)

Gio:
* Added FilterInputStream, Mount, FileMonitor, VolumeMonitor.
  (Marko Anastasov, Murray Cumming)
* Many methods' parameters have been reordered so we can 
  add default parameter values.
* Many methods now have overloads with less parameters.
  (Murray Cumming, José Alburquerque, Marko Anastasov)