Thanks for the question:) the main difference are:

Developers can create micro-task apps and be rewarded for it
The Fragments platform will be extendable and since developers can take a cut from revenue generated by their micro-task apps, they will help us to spread the platform much faster. We can adopt a much wider range of micro-tasks. Think Chrome extensions or commercial plugins.

Secondly, focus on mobile UI/UX - to attract even casual workers we will release Android/iPhone app
and moreover, companies will be able to mix in-house workers with global work-force and use the standalone version on their servers (we are talking to companies and hearing these requests a lot).

The team also have experience with marketplaces and we will release MVP before token sale:)

Let me know if I can elaborate more?