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

Calculating dependencies ... done!
Dependency resolution took 1.03 s (backtrack: 0/20).

[ebuild  N     ] app-text/mecab-0.996-r2::gentoo  USE="unicode -static-libs" 1366 KiB
[ebuild  N     ] app-dicts/mecab-naist-jdic-0.6.3b_p20111013-r1::gentoo  USE="unicode" 14624 KiB

Total: 2 packages (2 new), Size of downloads: 15990 KiB