eBay always starts with a tough or in detail java related telephonic interview. To pass through this interview you just need to know few things like Java interivew questions (like what is static, finally and also some difficult onces like what is generics and stuff), simple database questions (like query using group by), normal web related questions (what is HTTP and explain end to end working of the website request by browser). I think telephonic interview is easy to crack.
When it comes to onsite interview. Everything revolves around data structure according to me. They will expect you to code the programs at all times. give your best shot and groom your programming skills well before going to onsite interview at eBay.
Overall it was friendly and helpful environment during interview at ebay.