From the spec sheet, the new CPUs provide high performance at low battery power consumption, and integrated Gigabit Wi-Fi (802.11).
See Intel’s page on the new processors for more information.
Meltdown and Spectre are the names given to a security vulnerability that takes advantage of speculative branch execution to capture the side effect of cached data, thereby revealing protected data. However, just one of the two new processors addresses Meltdown while the other does not. Neither addresses Spectre.
Intel launched new eighth-generation processors slated for laptops this week: Ultra-low power 15-watt Whiskey Lake U-series chips and extremely low power five-watt Amber Lake Y-series chips. After the launch, Intel was asked if these two processor families include hardware fixes for Meltdown and Spectre.
Source: Intel’s New ‘Whiskey Lake’ CPUs Have a Hardware Fix for Meltdown | Digital Trends