The latest HTC phone with a slide-out keyboard is the HTC Herald, the successor to the HTC Hermes. The Herald is thinner, at 18mm versus the Hermes' 22mm, but vomits a camera and some processor power to do so. Luckily for us, everything else is the same. The phone still has a 2-megapixel camera, QVGA touch-screen, slide-out keyboard, WiFi and 3G data. You just can't do video-conferencing anymore because of the lack of cameras.
No other information is available now, but you bet our resident HTC fanboy (me) will update when news hits.