Hi,
I have not deployed the new 700 series Cisco AP's, but it is my understanding that the SAP702i is the standalone version made for autonomous deployments. CAP702i is made for controller based deployments. You'll need to get either the CAP702i AP's, or flash the AP's to make them lightweight. You will also need to make sure you have 7.5 code running on your 2500 WLC.
Best of luck.