Yes, El Reg, it *would* be quibbling.
Whether or not there is a 4G standard, consumerland probably assumes there is such a thing as 4G since we all know what 2G and 3G mean, we may know about 2.5G and may have seen 3.5G on our handsets.
So if a consumer has seen 2G, 2.5G, 3G and 3.5G come along, is it unreasonable for them to expect that a 4G product will work with whatever network upgrade their operator offers next?
Whether or not 4G is 'defined' is irrelevant in this case: what operators are calling '4G' is faster than their 3G offering (in theory). If the iPad is known to be incompatible with that technology, Apple is misleading their customers because their product is 'only' 3G and they know it.
Therefore, calling it the iPad 4G outside the US is nothing short of misleading.