Here's a great article explaining what ARK is planning to do: https://www.smithandcrown.com/event/ark-ico-platform-cryptocurrency-consumer-services/

I think the coolest things that ARK will do are the SmartBridge technology, and the ARK smartcard. The SmartBridge technology will allow the ARK network to communicate with and execute operations on other blockchains, as well as allow any other blockchains to communicate with and execute operations on other blockchains through ARK. Here's an example the article gives on this:


The ARK smartcard is also cool, it's main purpose is to accelerate the adoption of ARK and cryptocurrencies in general. It will be able to communicate with the ARK network to make payments.