Hi
Diane - own an iPad 2 w/ the 30-pin CCK - just plugged my camera's SD card into the kit and then into my upgraded device (7.0.2); the iPad brought up the images in the native Photo App immediately - WHEW! - there are some complaints on the Apple Store web site of some having problems w/ the CCK & the new iOS. BUT, I'm in the same situation, i.e. considering getting an iPad 5 when released - love the 'retina' display on my MBPro and I do a lot of reading on the iPad, so a sharper display would be my main reason.
Now as to an 'adapter' for an 'adapter', I would likely not go that route, plus the 'Lightning to 30-pin' adapter is about the same price as just buying a 'Lightning' CCK for an SD card (seems that Apple is selling that option separate from a USB CCK adapter, so that might be an issue for you? I just use the SD cards in my cameras). Hope others will 'chime in' especially those w/ some experience using these newer Lightning adapters - might need to make that decision myself - Dave