Spoilers from 2ch:
第427話｢地下の激闘｣につづく TO BE CONTINUED
Crappy Google translation:
Black heart along the way toward the black magic cult summer talk that it was said of future Rogue to Lucy who should future has changed, but the previous summerwhile you are fighting Gray and mulled-Gières, looking at the black pattern that undermine him was anxiety want summer Lucy worry Sunnah, what is even gray’s fellow of my people, and soothe the other hand, question Gray to be a betrayer of Council Council from other black magic cult members suspected crack But Gray, my goal’s book of END cares others, say that anything use anyone if to defeat the END of the same time approaching the summer we waste church hideout of enemy troops of Council Council also black magic cult was moving to subdue subordinates to report to the captain that there are gray with information betrayer but is someone that knew the strange, Gajiru became a member of the troops is to say On ■ Gray ” surprising “a piece are attracted … !! TO BE CONTINUED following the Episode 427 “underground of fierce fight”
What I got from this is that Gray IS pulling a Silver, in that he isn’t REALLY with these Avatar people, and they may even suspect that he’s double-crossing them. But at the same time, the mark on his body is worrying Natsu, because he saw it surface when they were fighting Mard together.
Also, Gray DOES sound like he’s fixated on END to the point where nothing else matters, and he’ll utilize anything and everything he can to find and destroy END. And Gajeel shows up for some reason (something about the Magic council, so maybe he’s working for them?). Sounds like he too is after Avatar. Plus, Future Rogue warned that they had changed the future…I think. ^^’
Basically, I’m not sure about any of the above, and am looking forward to some better translations to make more sense out of things haha.