Hello all. I've just done it, as well!
* Grey 2014 i3 REx w/Tera and the other optional packages (Park Assist, Tech and Driving Assist, 20" wheels, HK sound)
* 3 year, 10K miles per, lease
I was able to negotiate the MSRP from US$55.5K down to $49.5K, then essentially got full advantage of the $7,500 US Federal tax credit as a capital cost reduction (in US, it seems that BMW has typically been only passing on $4,875, but in March, that was upped it to $5,500 on the 2014s and BMW added $2,000 in "builder's cash"). After my trade (2007 Honda Accord with 70K miles) and an additional $4,000 down (excluding fees), the lease payment comes out to US$173 per month, which I'm happy with.
In addition, Massachusetts has a rapidly dwindling EV rebate fund, and the i3 qualifies for the max $2,500, so I should be getting that check in the next 75 days as well.
I haven't checked my software yet. They were supposed to upgrade it, but I don't know what, if anything, is in the 2015s that didn't make it into my 2014.
I dropped in a 40A circuit at home and installed a ClipperCreek HCS-40 L2 EVSE, which worked great last night (the first charge).
All I can say is that I absolutely love it!