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

Calculating dependencies ... done!
Dependency resolution took 1.04 s (backtrack: 0/20).

[ebuild  N     ] app-text/mecab-0.996-r2::gentoo  USE="unicode -static-libs" 1366 KiB
[ebuild  N     ] app-dicts/mecab-ipadic-2.7.0.20070801-r1::gentoo  USE="unicode" 11922 KiB
[ebuild  N     ] app-dicts/mecab-unidic-2.1.2-r1::gentoo  137225 KiB

Total: 3 packages (3 new), Size of downloads: 150513 KiB