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

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] media-libs/libogg-1.3.6::gentoo  USE="-static-libs" 430 KiB
[ebuild  N     ] media-libs/tremor-0_pre20130223-r3::gentoo  USE="-low-accuracy" 108 KiB

Total: 2 packages (2 new), Size of downloads: 538 KiB