Wait and see how Skylake performes as well as what DX12 brings to the table, saying that though if your happy with your current setup then there's no real point in ungrading unless you just want too
As said before please don't use your hand as a temperature guage for your CPU and that area in general. As for the question, I'd expect that area to be hot considering the CPU can get extremely hot! Nothing really to worry about I'd say.