Normally I would say keep it. It will be no less of a machine the day the new models are released.
However because you did buy a high-end supped up version, I would return it. Personally I have a 2011 iMac, but I don't game on the thing, just programming for work. One should only buy the high-end of they need every ounce of power they can get, that being the case the new iMac will most certainly be more capable for high end tasks by some measurable amount.
However because you did buy a high-end supped up version, I would return it. Personally I have a 2011 iMac, but I don't game on the thing, just programming for work. One should only buy the high-end of they need every ounce of power they can get, that being the case the new iMac will most certainly be more capable for high end tasks by some measurable amount.