If you notice that the brood is not growing (especially being stuck at teeny tiny larvae) and no new eggs are being laid, then that may be a sign that they're preparing for "diapause" (air quotes cuz it's not a true diapause). Some Camponotus sp. around here like to "diapause". They'll slow down and stop accepting proteins, along with the aforementioned lack of brood development.
IF you do notice that happening, then you can try taking them off of heat. Stop feeding protein for a bit, since they just won't accept it. But make sure they receive sugars. Since this is not a true diapause, they still need to eat. Do keep in mind that this does not occur with all CA02 colonies. It really depends on the specific location they were caught. If they aren't actually preparing for "diapause", taking them off of heat would likely stagnate any brood development.
Also, keep in mind that if you don't notice eggs being laid, camponotus queens lay eggs in batches rather than a continuous stream of eggs. So, it's possible that they may not be preparing for "diapause".
I'm not a professional, just letting you know some knowledge I've learned whilst keeping my own camponotus ocreatus colony that tend to have very similar winter behavior to CA02.
CA02 is such an awesome and beautiful camponotus sp, I hope your colony will flourish!