The eBay app has been readily available for pretty much most BlackBerry smartphones, except for the Torch 9800, since it was not ready in time for the Torch's launch. However, version 18.104.22.168 of the app will now enable Torch users all around to see what's good to bid on eBay right now. Aside from that, it's rather difficult to say if there are any additional improvements or features with the update to the popular app.
So if you've been resorting to checking out eBay using the Torch's web browser, you can now download the app directly from the App World which will naturally provide a suitable experience.
RIM BlackBerry Torch 9800 Specifications | Review