[Splat]

But at the moment there's no benefit to going there, except for a huge supply of enderpearls and relatively easy-to-mine obsidian?
Can you drop water there? I have no idea if or not that's a good defence against Endermen in 1.9.

Also, if it is possible to mine ice, this could potentially be a way of smuggling water into the Nether. Wonder if Notch has accounted for that.