Well it's hard to answer that right now since there's no actual specs available to the public, but I will say that it will probably be classified as however many COMPUTE chiplets there are giving that all Rome chips will probably have the I/O die. Technically the I/O die is a chiplet, but I believe it will go based off the number of compute chiplets available.
If it's anything like Naples where all dies are active and have a total of 4 chiplets, Rome can be seen like this:
- 8 Chiplets
- 9 Chiplets
- 8+1 Chiplets