Not yet. I was recently talking with IBj (IB rep on these boards), and he offered the following:
"New currencies: NZD, yes. Also Israel, Poland, Czech, Denmark, Norway, Mexico. We will try to get Brazil, Russia, and India as NDFs (non-settling). "
No timetable was given. I was hoping they would also offer the Icelandic Krona (ISK), but alas, it's not on their list.
I'm not sure which brokers offer it, but I'd like to find out more. 15.25% overnight rate and >1% daily swings against the major currencies sounds like a very interesting trading vehicle..