Forecasting oil prices is a rather tough job, especially if we are witnessing a regime change, rather than a temporary glitch in the markets. Nonetheless, here is the set of forecasts from the markets (options), forecasters (consensus) and Goldman Sachs:
Noticeable features: all, but futures markets bets are starting to converge in H2 2015. End-of-2015 forecasts are pretty close for Goldman and Bloomberg survey.
A bit more detailed reporting on forecasts here: http://uk.businessinsider.com/r-oil-prices-likely-to-rebound-in-second-half-of-2015-reuters-poll-2014-12?r=US.
All in, it does appear that USD70 bbl average price for 2015 is not out of line with market consensus, albeit it is not consistent with futures markets contracts.