There hasn't been any confirmation of such a device even existing for any carrier, but when you consider the market it would be aimed at (javelin or Bold buyers) then the logical time for it to show up would be late 2009 so that carriers are able to sell it before the holidays.
Mind you, even though that is the likely timeframe for release, you can't actually be sure which carriers want to take which devices, so you could see something like Att launching a new bold and t-mo coming out with a 3g curve.
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