These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild     U ] media-libs/alsa-lib-1.0.16_rc2 [1.0.14_rc3] USE="midi%* -alisp% -debug -doc" ALSA_PCM_PLUGINS="adpcm%* alaw%* asym%* copy%* dmix%* dshare%* dsnoop%* empty%* extplug%* file%* hooks%* iec958%* ioplug%* ladspa%* lfloat%* linear%* meter%* mulaw%* multi%* null%* plug%* rate%* route%* share%* shm%* softvol%*" 0 kB [0]

Total: 1 package (1 upgrade), Size of downloads: 0 kB
Portage tree and overlays:
 [0] /usr/portage