After much speculation, T-Mobile and Danger have officially announced the T-Mobile Sidekick 3. While it wasn't officially announced until today, most of the specs were leaked through FCC filings.
Features of the Sidekick 3 include:
Current T-Mobile customers will be able to buy the Sidekick 3 starting on June 28th. It will be made available to the general public starting July 10th. Pricing runs $299 with a 2-year contract, $349 with a 1-year and $399 for pre-paid. Sidekick.com has been updated to reflect the new device.