Sony showed off the Xperia ZL and the Xperia Tablet Z at the MWC (http://www.gsmarena.com/sony_mwc_2013-review-900.php), but no unannounced models. But unannounced models are starting to pile up in the rumor mill, the latest is the Sony Xperia C670X.
As a comparison, the Xperia ZL model name is the C650X, while the Xperia Z is the C660X. Recently we saw some browser info (http://www.gsmarena.com/sony_xperia_c680x_test_scores_hint_at_1080p_screen_42_jelly_bean-news-5550.php) on the Sony C680X and wondered if there will be a C670X. Well, most probably, yes