LTE Category supported by XZ2 Compact

[Endorphinity]

Specifications of the phone as posted on http://bit.ly/2HsNcO8 states that it supports "LTE (4G) Cat15 with up to 800Mbps".

However, Qualcomm's webpage on Snapdragon 845's communication features (http://bit.ly/2EAJlv4) reads:

"Snapdragon 845 integrates the Snapdragon X20 LTE modem, the world’s first-announced modem to support Category 18 download speeds. It is 20 percent faster than our previous generation advanced modem, delivering a market-leading 1.2 Gbps."

Can that mean that XZ2 Compact owners can expect the faster LTE category support in the future software updates?

[Endorphinity]

Upping the question. Is it the same thing as a QuickCharge 4.0 support, which exists in the chipset, but not enabled in the phone, i.e. pure marketing decision?