NTT Docomo announced the sale of Nano SIMs from November 1, 2012. Without a doubt, JCI will also offer them shortly, so it will be easier to use an iPhone 5 with a b-mobile SIM card. For reasons not yet entirely clear, iPhone 5s won't connect to Docomo's Xi LTE network. So an LTE iPhone will be stuck at 3G speeds when used with Docomo.
Once the iPhone 5 is jailbroken, we'll have a better idea of the problem. This will only work for unlocked iPhones, for example from Hong Kong. The US Verizon iPhone 5 is reported to have an unlocked GSM/W-CDMA/LTE baseband (thanks to Google), so it might work with Docomo. I highly recommend waiting for confirmation that Verizon iPhones work with Docomo before running out and signing 2-year contracts.
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