From a design aspect, getting a sculpt completed is often quicker than designing a new unit for a game, something I can vouch for, trust me.
That is not to overlook the importance of sculpting, far from it - arguably sculpting is what ultimately sells the whole package (design/concept, rules, sculpt, studio paint-work) of a skirmish minis game model really. But the rules-design phase is especially and unpredictably time-consuming, so it is no surprise that Anima Tactics has a number of units that have been outlined in terms of rules for quite some time, although these do go back some distance in some instances. - as far as 2011!
Of these units that have yet to appear, a number have been discussed on the Cipher Studios Anima Tactics Forum.
- Fate (2011): German card; Light, Mystic, Level 40, Wissenschaft
- Crimson Death (2013): English card; Dark, Warrior, Level 50, Samael
- Alma (2014): English card; Neutral, Warrior, Mystic, Gear, Wissenschaft
- Zenobius (2014): Spanish card; Dark, Prowler, Mystic, Azur Alliance
- Alexias (2014): Spanish card; Dark, Prowler, Warrior, Level 60, Church
- May (2014): Spanish card; Dark, Prowler, Warrior, Level 40, Empire - forms a Team with October and September (no, I don't understand the choice of months either....)
- Sharsha 'Friedgunde' (2014): Spanish card; Dark, Warrior, Level 50, Wanderer who may not be used in a Black Sun Party - her art has a sort of female Frankenstein vibe.
- Kaori (2014): Spanish card; Dark, Mystic, Level 35, Samael, sort of Anima Tactics witch on broomstick!
Add in that September has not yet been given a release date, and the possible alternative Celia (shown in this post), then it is almost like a small stockpile of concepts is building up - 8 by my count that are 'known'. It is easy to speculate on the reasons for that, but if an Anima Tactics Kickstarter were a possibility, I for one would be backing it in a heartbeat. Now that is pure speculation, but I can only hope the game gets some renewed momentum.