It's not exactly hard to make predictions in consumer tech these days.
Take last year's products. Subtract any made by companies that (a) don't exist any more or (b) are losing way too much money to keep releasing the same old stuff over and over again.
Then take the number after the product and add one, maybe with the word Pro, Plus, or something similar to follow.
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Repeat.
Hence these rumours of the iPad Plus, iPad Pro, HTC One M9 and Galaxy S6. They could happen. But you knew that already.