Google announced that AdWords is adding three new cross-device conversion reports including devices, assisting devices and device paths.

Here is a brief explanation of each report:

Devices: see how much cross-device activity is happening in your AdWords account
Assisting Devices: inform your device bid adjustments by learning how often different devices assisted conversions on other devices
Device Paths: examine the top conversion paths for your customers using two or more devices

Here is a sample of one of those reports:

They also are adding new search benchmarks that show the influence of cross-device activity across the full search conversion path.

Forum discussion at Google AdWords Help and Google+.