I wonder if the Borg are really going to be an enemy here. It felt like they were after something else, and it wasn't necessarily to assimilate people or destroy.
I admit, while the digital de-aging of John DeLancie looked straight out of X-Men: The Last Stand, I did like the fact that they did it. He is an immortal being, so naturally he shouldn't age. That we saw him still young looking at first, and that he 'aged himself up' to better with with Picard, was the perfect thing to do.