the K in 4690K means that your processor's multiplier is unlocked, meaning you can easily overclock it. Thus, you will want to look for an LGA1150 socket motherboard that gives you the option to overclock by tweaking the multiplier. These would be the Z87 and Z97 series of motherboards (Z is the prefix for enthusiast-class). Z97 motherboards are preferable to Z87 motherboards because they are newer and generally better for about the same price.
In terms of what you want to look for when buying a motherboard, you just want to make sure that it looks the way you want it to look, and provides the certain functions that you want it to provide. Also you need to keep in mind what other things you want to plug into the motherboard (for example if you want to have a multi-GPU setup, you need to make sure the motherboard supports multiple GPUs). Lastly, you need to make sure the form factor of your motherboard matches the form factor(s) supported by the case that you want.