It's no way going to double by the end of the year. By the block halving (which is actually mid 2016) I think it will go up in value but no idea by how much. Maybe a hundred dollars or so. I expect a crash shortly after though as it will likely be caused just by people buying coins thinking the value is going to sky rocket.
I agree, no reason or big news that could drive a double in price. If anything I think we have a bigger chance of the price cutting
in half. Mostly because the whole greek debt crisis runup was very weak, and shows we're on a slippery slope. Also shows most everyone involved with btc is doing so for speculative reasons