I think the release lists in the Japanese verison have these two games (well they should seeing as everything Nintendo released is listed*) but that is it sadly.
Looking at the master list of music files there were no FE4 or FE5 tracks planned either

One thing I want to know. Who started that rumour that Sakurai liked Sigurd? With 5 million stickers in the game if Sakurai even gave a shit for Sigurd at the very least there would be a sticker...
*-The Japanese one is the only one that is fully correct (they had to omit days from the US one to lack of data and months from the European one due to severe lack of data...)...the European one seems to lack anything after March 2008 inspite of being released at the end of June. It was pretty Jarring to see anything related to Cooking Guide: Can't Decide What to Eat still under the Japanese name inspite of being out in English.