HTC Zara is actually HTC Desire 601, according to the usually very reliable
evleaks. An official render (http://www.gsmarena.com/htc_zara_official_photo_leaks_packs_47_display_and_sense_55-news-6609.php) of the phone has already leaked once along with a bunch of specs.
HTC Zara will ship as the Desire 601