My advice is that you keep the Intel® Core™ i5-2500K and get a couple years plus out of it. Our next generation Intel® Core™ processors are going to be a die shrink and there will be some improvement to the IGP (Integrated Graphics on Processor). In the end the performance increase on a die shrink (even with the move to tri-gate) is not going to give major performance improvements. Since the Intel Core i5-2500K can easily be overclocked you can get performance that can last for years to come.
In 2 to 4 years it is possible that that software may have developed to the point of needing to upgrade your system but I think that it is going to be on the later over sooner in that time frame.
Intel Enthusiast Team