Recently, Qualcomm announced their Snapdragon X24 LTE modem, the first LTE modem on a 7nm FinFET architecture. While the Snapdragon 845 is being made on the second gen 10nm FinFET, rumors claimed that the 7nm FinFET node would be used for the Snapdragon 855.
According to some contractors of the company, there might be a good chance that we're about to see the first Soc made on the 7nm FinFET process, providing better overall performance and efficiency. The Snapdragon 845 stays on the 10nm process since it would be to costly to switch processes right now. While this chip (Snapdragon 845) is expected to offer a nice performance boost over its predecessor, the Snapdragon 855 will be an even bigger game changer.
A reliable source, Roland Quandt, leaked this information on one of his latest tweets.
"Qualcomm won't say it, but their contractors do. Snapdragon 855 (SDM855) is the first 7nm SoC. (probably the one the X24 modem ends up in)"