I can't recall seeing any specific statement with a confirmation, but Kimpton properties will be fully integrated into IHG Rewards for earning and redemption so I don't see any reason why they would be excluded from the Chase certificates.
Of course, keep in mind that awards at Kimpton properties have always been subject to capacity controls (in my experience, award availability has generally been much worse compared to IHG properties including Intercontinentals, and that's with my Inner Circle status which allegedly taps into a slightly expanded bucket of award night availability), and I'm not sure if IHG will be forcing any changes on that front when the properties integrate. I can imagine that, with many Kimptons amongst the nicest IHG options in many cities, that award availability may only get worse once all IHG members have access.