I don’t think this is well documented, but the Japanese version of Wild ARMs XF has a connectivity feature that unlocks additional content if you own Wild ARMs 5. Since XSeed released Wild ARMs 5 and are about to release Wild ARMs XF I wondered if the bonus items would appear in the North American version of Wild ARMs XF. Jimmy Soga sent over this answer, “to answer your question about WAXF and WA5 connectivity, there will be none for the US version. We made WA5 have all the upgrades and bonus materials in the game w/o the connectivity to the WAXF as we thought the fans will appreciate it more that way.”
I guess I won’t be linking up my PSP to my PlayStation 2, but that is fine with me as long as we get the same content.