This new character is not Kasumi Alpha (died with the death of Alpha 152), rather the girl seen at the end of the DoA5 story.
By the way, we know that this is a creation of Donovan but I'm not so sure about it having the same appearence of Kasumi... otherwise why to keep her face shrouded in the mistery?
In the past fans have already speculated that she could end to be a mix of kasumi and Ayane in her facial design, and a JP twitter also posted a curious comparison with the same Ayame:
Personally I always been curious to know more about her considering that last shot that show a tear on her face (for being forced to kill or for other reasons?). While Alpha 152 can't be too much interesting (she is a sort of automaton programmed to kill, something that give to her a cool feeling but for me everything end with it), this character owning an human side could end to be pretty interesting just like Kasumi Alpha getting an original baby personality (anyway different from the sadistic-crazy one implied in her only cutscene in the original DOA2).
About her moveset, some people said that she could end to get a mixture of the 4 ninja moveset like showned in the boss of DoA5 (that again wasn't the same kind of clone). I wouldn't like too much this occurrence (in this case I would prefer rather to get back Raidou) however there are the chances for something similar.