They brought over The Last Story, but it looks like they're passing on the final Operation Rainfall title.
A localization of Pandora's Tower or Retro Game Challenge 2 is not in the cards at XSEED, according to members of the staff who answered questions on Kotaku last week.
Despite bringing The Last Story to North America last week, an XSEED representative plainly stated "I don't believe [Pandora's Tower] is in consideration right now."
Nintendo of America brought over Xenoblade Chronicles earlier this year, and currently, Pandora's Tower is the only Operation Rainfall game to not make it to North America.
Regarding Retro Game Challenge 2, an XSEED representative said "Sorry, man. That ship has sailed."
That comment goes in line with a prior comment, which stated that Retro Game Challenge was one of their biggest flops. At E3 2011, we asked XSEED about the possibility of breaking up the Retro Game Challenge sequel into DSiWare titles, and they said that the DSiWare file size was too restrictive to make it feasible.