Hot Hardware published a review on the Lenovo Stack: Modular Gadgets For Road Warriors @ HotHardware.com A quote from the article:

There's a reason the Lenovo Stack has a ThinkPad logo emblazoned on each component. Over the years, the name ThinkPad has become synonymous with mobile professionals. For the most part, ThinkPad has been reserved for tablets and laptops, but with the Lenovo Stack the company is introducing the brand to an entirely new category: accessories.

First unveiled at CES 2015, Stack is as much a new concept as it is a product line. In a nutshell, this is Lenovo's take on a line of peripherals that all work with one another - or stack together - via a custom connector...

 Lenovo Stack Review: Modular Gadgets For Road Warriors @ HotHardware.com