I don't have a link or document stating that, but there have been several discussion around this subject. Here is one link. I have also ask Cisco SEs about it. I don't think, it is on road map for feature either.
Page 20-21 of this switch guide has a chart that says h/w NAT isn't supported. The NX-OS config guides I've seen that mention NAT do so in the context of IPv6 saying IPv6 eliminates the need for NAT/PAT, so I wouldn't count on seeing NAT in the 7k's. Grab a 6500 dedicate a router to that purpose.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...