The eBay App has updated in the Store with the following:

Release notes
We have been listening to excellent suggestions about usability, and have made many changes to enhance the experience as a result.  This update includes several changes improving the ease of use, as well as design of the app.  We will be adding more live tiles and seller functionality for creating listings in the near future, and continuing to add features based on the feedback we receive. Please provide feedback or bug reports via the app’s Settings -> Rate and Review.
– New features: my eBay messages, my eBay purchase history, ask seller a question, view seller’s other items, save a seller
– Pin to start and live tile features: pin my eBay lists and eBay items to your start menu, receive live tile updates to the application tile, pinned lists and pinned items
– Enhancements: better scrolling, more search features and filters, bug fixes
We are working hard to provide more features in each of our releases! Please provide feedback via the app’s Settings -> Rate and Review.

Source: Windows Store