That one silhouette on the left looked somewhat like the armoured Arcadios.
The fight between Jura and Laxus will hopefully be rather interesting. Though this is set up for Laxus to lose, unless Mashima really expects us to think that Laxus is able to defeat the strongest human mage with the power of his 'feelings'.
Does that also mean that Jura is now stronger than Makarov? I find this to be highly doubtful, and there is also the case of when Makarov said Jura is now around Gildarts' strength, all of this is rather confusing to me.