(Possibly) Along with the Anniversary update, (or in March,) we'll get a new update.
The Following Kamihime will receive a makeover on their in-battle sprites:
▼ Souls
Elite - Gawain, Cassiopeia, Gilgamesh and Granuaile
Standard - Van Helsing, Billy The Kid, Yukimura, Merlin, Beowulf, Olivier and Lancelot
▼ Kamihime
SSR - Satan, Sol, Michael, Gaia, Ares, Svarog and Amon [Unleashed]
SR - Beelzebub, Artemis, Cybele, Oberon, Ramiel, Baal, Brynhildr, Agni, Amon, Tsukuyomi, Maeve, Demeter and Pharol
R - Skuld, Circe, Dazbog, Astaroth, Urania, Orpheus, Zephyrus, Indra, Cherubim and Nergal
Some got small touch ups and edits for higher quality (Agni/Svarog/Oberon, etc) whereas some were completely redrawn and redesigned. (Satan/Beelzebub/Ares + all the standard souls)
Here's an example, I'll show the before and after (hime) sprites some from each rarity:
won't spoil them all, tho (too lazy)
but it's pretty neat all the older "badly?" drawn girls are getting new faces while still keeping their originality...apart from Ares when her voice actress changes. no more psychotic laughter
NSFW Spoiler - They redrew some story harem scenes. They might do with more in the future. (Probably currently working on a large amount of more sprites/episodes) and planning to release them all in the next big DMM update.