For what Izayoi/Tsubaki say at the end looks that Izayoi is the 0 Unit. It's kinda simple to understand, Izayoi is the Murakumo prototype, so a "Unit 0" name fits it.
11/24/12
VS Chie: http://www.youtube.com/watch?v=iE9B71rNE_M#t=16m34s
VS Chie: http://www.youtube.com/watch?v=iE9B71rNE_M#t=32m34s
VS Chie: http://www.youtube.com/watch?v=iE9B71rNE_M#t=51m24s
Edit: VS Naoto: http://www.youtube.com/watch?v=ZLZsgK-m9Fo#t=22m1s
With 1000 of minimum damage and 100 of P2, the Crush trigger will be very usefull for adding good proration like Hazama with Hotenjin, or to finish the combo with good damage.
11/17/12
VS Kanji: http://www.youtube.com/watch?v=3-yLkHlbEnY#t=3m20s
VS Kanji: http://www.youtube.com/watch?v=3-yLkHlbEnY#t=5m20s
VS Chie: http://www.youtube.com/watch?v=3-yLkHlbEnY#t=m29s
VS Chie: http://www.youtube.com/watch?v=3-yLkHlbEnY#t=9m49s
VS Labrys: http://www.youtube.com/watch?v=o2jxAW7nrqc#t=8m14s
VS Labrys: http://www.youtube.com/watch?v=o2jxAW7nrqc#t=11m18s
VS Labrys: http://www.youtube.com/watch?v=o2jxAW7nrqcT014m35s
VS Kanji: http://www.youtube.com/watch?v=IrAQ-lL--xI#t=5m42s
VS Kanji: http://www.youtube.com/watch?v=IrAQ-lL--xI#t=8m58s
VS Kanji: http://www.youtube.com/watch?v=IrAQ-lL--xI#t=13m25s
I don't know if it was already posted, but . . . int the end of Phase 4 novel Caecelica was revived by Kokonoe, maybe Kokonoe wants her to save Lotte Carmine with her cure magic?