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The most recent device is the Cyclone V, and they are impossible to get hold of although they are supposed to be in production.
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As said, Cyclone V isn't appropriate for the project, in so far the comment is somehow off-topic.
A small selection of Cyclone V devices is availabe as engineering samples and being shipped to customers since several months. If you consider Cyclone V for a new product, you can ask Altera representatives or distributors about the time schedule of the respective device and see if it fits your plans.