This is another type of question they ask to find out what you know so they don't tell you something that you already know. If it is an existing product, then you should definitely know what it is. If not, and after you researched as much as you could, tell them the little that you know. For example, I interviewed for a group within Microsoft that was very new. I had no idea what the team was creating but I was interested because it was a new technology. I found out as much as I could and when they asked me this question, this is how I answer.
I didn't know much, but after researching, this is all I could find. This is exactly what I said and they responded by telling me more detail. It wasn't wrong, but at least I said enough about the group to sound like I researched a little bit. That's basically all you have to do for this question.
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