I'm not sure what's shipped within the CD-ROM but as far as the IOS, it's just one .bin file .
I can't tell you the IOS version that is included in the CD-ROM based on the item description you've posted but you are entitled to download the latest and greatest IOS version from cisco.com provided you have a valid Cisco contract and download a version within the same feature set (Advanced Enterprise Services with SNA Switching).
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...