Reports indicate that ASUS Z77/H77 boards have Intel Thunderbolt header to support upcoming new Intel thunderbolt devices. These header will require an external add on expansion card that is sold separately.
Although Z77 and H77 chipset, Intel hasn’t integrated this technology into the chipset. To date, it seems that ASUS is leading the industry with an exclusive Thunderbolt support using an external add on card. The card will be connected via the TB_Header as seen in the picture below
It is rumoured that it will be available on mid range and high end models. Stay tuned for more updates.