The upcoming Samsung Galaxy Note 9 could feature a more robust heat dissipation mechanism via copper pipes if rumors are to be believed. Also, a spares shop has leaked images of some of the Note 9's components leading to speculation that the spares of the device might already be out in the wild.
https://www.notebookcheck.net/Pictures-of-individual-Galaxy-Note-9-components-leak-heat-dissipating-copper-pipes-inbound.320080.0.html