To test if your XPS 13 is affected by the CABC, go to this test page. Dell has issued a fix for this, however it is only available to run in Windows. While it saves a bit of power, it is generally undesirable, especially for Linux users who are likely to be switching between dark and light screen content. In the XPS 13 the display panels (both FHD and QHD+) come with Content Adaptive Brightness Control (usually referred to as CABC or DBC) embedded in the panel firmware - it adjusts the screen brightness depending on the content displayed on the screen.
The installation process for Arch on the XPS 13 does not differ from any other PC. Respective clock frequencies are 2.5 Ghz (up to 4GHz in Turbo-mode) and 2,4 Ghz (up to 3.8 Ghz), respectively.
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The same mentioned models are also available with the Intel Core i7-7660U (aswell as i7-7560U) with the Intel 640 Iris Plus onboard graphics. However, in some models, including those available to employees and possibly Dell partners (and/or business customers), memory speed is indeed available up to 2133 Mhz LPDDR3 (non-upgradable). Prior to previous information and current specifications available provided by Dell (at least to regular customers), it is not available with the 2133 MHz RAM speed. It will now also be available in Rose Gold. These fourth gen models includes Intel's Kaby Lake CPUs and advertised with up to 16GB LPDDR 1866 MHz RAM and a 1TB PCI SSD. Just like the older versions ( 9333, 93) it is available in different hardware configurations as well. There is only minor hardware differences between them, mostly in regards to the mainboard microchip manufacturers. The laptop is available since October (pre-2017 model) in both a standard edition with Windows installed as well as both a pre-2017 model and a 2017 model (with insignificant hardware differences) Developer Edition with Ubuntu 16.04 "SP1" installed, featuring kernel 4.8 as of now. The Dell XPS 13 Late 2016 (9360) is the fourth-generation model of the XPS 13 line.