My used 2015 V8 VIP came with the credit card key. I find it pretty handy. I carry a lot of things in my pockets, so it's nice if I can reduce the bulk a bit. And since it lives in my wallet and it means I pretty much always have my car key on me.
Per Kia's documentation:
2015: V8 Luxury only, not available on the V8 Premium (V6 introduced in US for 2016 MY)
2016: V8 Luxury only, not available on V6 models
2017: No mention of the credit card smartkey, so I suspect it is no longer available as of the 2017 MY