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

Calculating dependencies ... done!
Dependency resolution took 1.01 s (backtrack: 0/20).

[ebuild  N     ] net-irc/irssi-1.4.5-r2::gentoo  USE="perl proxy -otr (-selinux) -verify-sig" PERL_FEATURES="ithreads (-debug) -quadmath" 1188 KiB
[ebuild  N     ] net-irc/irssistats-0.75-r3::gentoo  54 KiB

Total: 2 packages (2 new), Size of downloads: 1241 KiB