EDIT: Apparently I am a big idiot and confused warp scramble range with webbing range and messed up the fact that Mordu's is a second Caldari / Gallente cross. FAIL!!!
For the longest time in EVE, there was a weirdness that there was no pirate faction ships between Amarr and Gallente empires, nor one between Caldari and Minmatar, but there was two between Gallente and Minmatar, the Serpentis line (Daredevil, Vigilant, and Vindicator) and the Angel Cartel line (Dramiel, Cynabal, and Machariel).
With the introduction last year of the Sisters of EVE ships, the Astero frigate and Stratios cruiser (and later the Nestor battleship), the missing link between Amarr and Gallente was filled. Now with Kronos expansion this summer we get three Mordu's Legion ships that will fill the gap between Caldari and Minmatar and give us a complete faction ship array.