Your current motherboard may not be compatible with the latest 4th generation Intel processors, such as Haswell. So if you're looking to upgrade the CPU to a Haswell, you may need to a new motherboard too. However the i7-2700k is still a great processor and is at the top of the high-end benchmark charts, and there is no need to upgrade yet, unless you require more power.
Most motherboards which support the i7-2700k also support the i7-3770k (check your CPU support list just in case); so you could upgrade to one of those, which provides a little more power. But again IMO it's not worth upgrade to, as it'll only provide a little more power and you'll be spending more cash on it.
If you desire a more recent Haswell processor, again you...