Hardware manufacturers have proposed their own version of the nano-SIM, which they think should be made the standard. Once chosen, the other manufacturers will then have to license it to use it in their devices.
Two of the designs put forth till now are by Apple and Nokia. Apple's design makes use of a tray to hold the nano-SIM, not unlike the ones it uses on the iPhone and the iPad. Nokia, of course thinks that this is not a good idea and that its version of the nano-SIM has significant technical advantages. Moreover, Motorola and RIM seem to agree with Nokia on this.
But if you think Apple is alone in this battle, then you're wrong because Apple is being backed by most of the European Telecommunications Standards Institute (ETSI). Moreover, Apple is registering six different European subsidiaries as voting bodies, that can provide up to 45 votes each, which should be more than enough to outnumber Nokia's existing 92 votes.
Either way, it's certain that the nano-SIM is coming your way shortly. But then, considering the technical advantages it has, it's actually a good thing. And it will be backward compatible with regular SIM using an adaptor. Just make sure you don't lose it
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