The train companies are currently clamping down on passengers who don't fill in the date on their Carnets.

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Earlier this month, for example, Sony said that demand for its new Daily Edition Reader is so strong that while it hopes to fill orders by Christmas, it can't guarantee a delivery date.

WSJ: Barnes & Noble Pushes Back Store Debut of Nook

With the arguments in favor around economics and customer happiness and the arguments against limited to a bit of an issue around pixels and the downsides of size, Apple seems likely to fill the hole in the product line sometime this year, and perhaps the June date is a real one.

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