It includes info on the hardware: ALC3263 audio, BCM4352 network. Issues (presumably all fixed/worked around now that Dell is officially selling a DE) included the above-mentioned ACPI issues, sound (HDA/I2S, mic, headphone output) keyboard debouncing, trackpad freezing (and having to run in PS2 mode), and un-suspend display corruption.
Note, Major Hayden, who wrote the original post ended up switching to a Lenovo X1 Carbon: https://major.io/2015/03/30/review-lenovo-x1-carbon-3rd-gene...