Engadget spotted the iPad battery replacement service is not a battery replacement service at all. It seems the only option you'll have will be to cough up $99 (+ shipping) for a new iPad, which will contain any of your personal data.
We can see the puzzled look on your face from here, and we're sharing in the same disbelief. Apple is actually saying that it won't bother cracking open your withered iPad, replacing the battery and sending it back your way; instead, you'll pay $105.95 (including shipping) for a completely different iPad, which certainly has its pros and cons. On one hand, you're getting a new (or potentially refurbished, actually) iPad in around "one week," but on the other, you'll be waving goodbye to every morsel of personal data on the device that you send in -- unless you backup beforehand, of course. Here's Apple's take on answering "will the data on my iPad be preserved?"
"No. You will receive a replacement iPad that will not contain any of your personal data. Before you submit your iPad for service, it is important to sync your iPad with iTunes to back up your contacts, calendars, email account settings, bookmarks, apps, etc. Apple is not responsible for the loss of information when servicing your iPad."