The BlackBerry Javelin will replace the BlackBerry Curve when it's released. Interestingly, there will be no 3G support, but the Javelin will have GPS and WiFi. CrackBerry has posted some nice pictures of the device that you can see at the link below.
512 MHz Processor
256 MB onboard flash memory (more room for apps)
Hot-swappable microSD slot - located under the battey door
480 by 360 high-res HVGA+ display
Micro USB charging/syncing port, w/ high speed data