Most companies with existing products won't pre-announce for fear of cannibalizing sales from their existing products. However, for new entrants it makes sense to pre-announce. They don't have to worry about cannibalizing their existing products and hopefully by pre-announcing they can steal sales from their competitors. Just looks at what Astak did and what Wizpaq is doing. Wizpaq won't have a product out until this fall, but their thread announcing their product grew very quickly.
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