"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
AirPods and AirPower: Everything We Know
Some MacBook Vents Blocked, Causing Heat Issues? Thermal Paste? [Updated]
While some users report having found the plastic, others report not finding the plastic, so mileage may vary.
Meanwhile, due to the controversy surrounding the excess Thermal Paste, MacDevCenter disassembled their MacBook Pro to see if reducing the Thermal Paste would indeed cause a significant change in the running temperature. Contrary to other anecdotal reports, they found there was only a 2 degree difference in temperatures before and after the extensive disassembly.