In the last page of Chapter 292 there were a dragon and a man fighting. The dragon might be Igneel and the wizard Natsu. Because the man is wearing a WHITE SCARF (i think that it’s a scarf, but I’m not sure) and he is using FIRE to fight. And the dragon is also using FIRE which means none other than Igneel.
In mangafox.me someone wrote a theory and actually I agree with him/her.
The guy talking to Arcadios said something like… “Festival .. the Grand Magic Games, once called something else… the Dragon King Festival." Maybe before the Grand Magic Games were a battle among the dragon slayers and whoever win will gain the title of "dragon king”.
And Igneel (and the other dragons) and Natsu (and the other dragon slayers) fought there but something happened and all memory was erased off it and ‘false memories' of a 'false life' was planted into Natsu, Gajeel and Wendy about Igneel, Metallicana and Grandine taking them in as their own. If that's true that means that the dragon slayers are from the past which explains why they couldn’t pass the 80-years-or-older barrier in the FT Festival Arc.
Or the last page of the chapter is a scene from the future in which Natsu and Igneel are fighting.
I can’t explain it in any other way. Do you have your theories?