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

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

[ebuild  N     ] app-vim/vim-addon-mw-utils-20121105::gentoo  10 KiB
[ebuild  N     ] app-vim/tlib-1.27::gentoo  122 KiB
[ebuild  N     ] app-vim/snipmate-0.87-r1::gentoo  21 KiB

Total: 3 packages (3 new), Size of downloads: 152 KiB