Thanks for your feedback! We originally targeted eBay's SOAP API but they have since released a REST API, which we pivoted towards. I'm sure you'll agree that there is little point in working with an API that is likely to be deprecated.
As to the release date, we are targeting the beta release for Q4. However, if you would rather wait, that's fine; beta releases are not for everyone. However, we are confident that we can deliver a solid and reliable eBay integration in Q4.