libxbps:
 - transaction: avoid fetching the whole pkg when updating and only fetch
   modified files from target pkg.
 - properties: (update-first) still unimplemented.

xbps-create:
 - Move all configuration files to <prefix>/share/<pkgname>/conf/<cffile>.
 - Add -i --installed option to create binpkg from an installed version.

All:
 - Add support to sign with PGP or RSA the repository index files.

Issues listed at http://code.google.com/p/xbps/issues/list

Surely more stuff...