With CS6 and CC you can use all CR 8.x versions too. But in CS6 are only added new cameras, no new functionality as it is done with CC.
If you are a Cloud member you can also use the CC version.
If not, there is an offer from Adobe to get Photoshop and Lightroom from the Cloud for one year to a vary low price, depending where you live. (Something more around 9USD or 12 EUR)