Not as much continuity as you might think. While Soran was a refugee from a borg attack in generations it was never established that it was the attack on the El Aurian homeworld. It's possible that the El Aurians just kept running from planet to planet over the course of 60 years. The two places that are known to be attacked are Earth and Kronos. Both places that accessed future technology in the last film. Remember the Klingons had Nero's ship for 25 years. I think that this character is going after technology from the Narada.
That's a ridiculous, huge amount of continuity linking this film to another one made almost twenty years ago - and it would be to no good end at all. No one cares about Soran.