HTC’s statement mentioned, “The primary update will include an upgrade to Android version 4.0.4 (Ice Cream Sandwich), in addition to an improved Sense experience which will enable the ability to map menu functions to the ‘recent app’ key — improving visual presentation in non-ICS apps like Facebook — and improve tab management in the browser with a dedicated tab-switching button.”
Do expect additional improvements such as a refined white balance and a continuous auto-focus mode for the camera, not to mention a single sign-on for Facebook across websites and apps. No idea on when Android. 4.1 Jelly Bean update will arrive though, but patience is the best policy.