Ugh, seriously. I can't believe how unreasonably angry I still am about this. I think I would have been less mad if they'd made the 3DS casing out of skinned puppies.
Atlus doesn't have a European branch, so it's up to some other company to take on the publishing duties if we're going to see a release of Overclocked (or any other Atlus game) in Europe. I honestly wouldn't bet on Nintendo bringing it over here, since it's considerably more niche than Dragon Quest (and they're idiots, see: region locking).
Ghostlight published Persona 3 Portable in Europe, so if that did well, they may consider bringing Overclocked over here. Or some other company may take pity on us. Isn't waiting fun?