LegendaryCasterItem
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Legendary Caster Staff Stats
While I haven't seen any details on how this is acquired, it's safe to assume (since this information was most likely data-mined from the patch 1.11 files we currently have access to) that it's going to involve Naxxramas. I must say, these staves - different for different classes - look perfectly delightful and I would be happy to have one - though I can't say I look forward to the no doubt extensive efforts required to get it.
New Items in Patch 1.11
Here's an interesting list of new items we can expect to see in the 1.11 content patch. There are some components shown for what appears to be a legendary caster item, though the final product is still a mystery. And I don't know about you, but the suspense is killing me!