Confirmed in the latest Famitsu, these two characters (along with normal Labrys) will be joining P4A's arcade version as well as the console versions (most probably).
Dates that they'll be added to Japanese arcades:
- Labrys: March 22nd
- Elizabeth: April 5th
- Shadow Labrys: April 19th
Elizabeth and Thanatos, huh? Are you thinkin' what I'm thinkin'!?