Post this under 'no big deal,' as SMT Devil Summoner: Soul Hacker on the 3DS has been slightly delayed in Europe. Atlus will now release it on September 20, with a digital release on the eShop following on September 25.
The 3DS game has been available in North America since April, and in Japan for over a year now. Still, a one week delay shouldn't hurt too badly. The game originally launched in 1997 on Sega Saturn, followed by a PS1 release in 1999. Both were exclusive to Japan.