A while ago the certification of a new PS4 model bearing the number CUH-11xxA (where xx indicates the report) appeared first on the official website of the Directorate of General Resources and Equipment of Post and Information Technology of the Republic of Indonesia, then the FCC certification appeared as well.
While Sony still has to make any official announcement on the issue, the certification for the new model has finally been published by the Japanese Ministry of Internal Affairs and Communication.
Interestingly, the new model received two separate certifications, both different from the original CUH-1000A.
CUH-1100A (first certification)
CUH-1100A (second certification)
The first certification is exclusively for the CUH-1100 A, while the second is for both the CUH-1100A and the DUH-T1100JA, which indicates the non-retail testing kit of the console.
The difference between the two new certifications and the original (and also between the two new certification themselves) is in the antenna power and frequency pattern, most possibly meaning that there will be two slightly different models under the same code.
Again, this doesn't mean that there won't be more differences, but this kind of certification is exclusively dedicated to wireless equipment, so it won't mention other parts.
What we do know is that the new model won't be a full redesign, as according to Sony's coding standards that involves an incremental change in the first digit of the number, while strictly internal evolution is indicated by the second digit like in this case. It's also not a bigger hard disk, as that comes with a change in the final letter of the code (IE: A would be changed to B).
With Gamescom and Tokyo Game Show incoming, we might get to hear something official about this soon enough.