The WSJ is reporting(it was more of a footnote really):
The Journal plans to charge subscribers $17.99 a month for iPad subscriptions, according to a person familiar with the matter.
The WSJ is also offered on the Kindle, but for $15 you're only getting the minimum; a lot of content doesn't survive the conversion process. You can also get a paper subscription for $30, and it includes full web content. This brings to mind a couple questions.
Why would someone get an iPad subscription when the paper sub has such greater value? Yes, it's on the go, but you can get most of that content off the web with the iPad's browser.
Why does the WSJ expect me to pay twice (or even 3 times) for the same content? Wouldn't it be better to have a free iPad app that works in concert with the paper sub? (Something simple, which only delivers the web content.) If not free, then why isn't it really cheap? You already got my money. Why should I pay for it again?