HTC One pre-orders start on April 4 (a day earlier than expected), while the actual units will become available on April 19. The smartphone will cost you $200 for the 32GB model and $300 for the AT&T-exclusive 64GB one with a two-year contract, of course.
The pre-order campaign will launch on April 4 at 1PM CT, so you might want to bookmark that link. AT&T will throw additional HTC Media Link HD wireless HDMI adaptor, which will allow you to share wirelessly media content to your HDTV.