I just tried a simple thing in the chat box and nothing happened, so I'm not sure what I did wrong.
Lua Code:
/script CENTER_SCREEN_ANNOUNCE:AddMessage(0, CSA_EVENT_COMBINED_TEXT, "Justice_NowKOS", "message", "message2", nil, nil, nil, nil, 10000, nil)
There was no error, so it seems to be syntactically correct, but simply nothing happened.
Edit: Ah, hold on, I think maybe they changed the names of the categories....
So far I think CSA_CATEGORY_LARGE_TEXT has replaced CSA_EVENT_COMBINED_TEXT, but I'm not sure about the others.
Edit 2: OK I think I've worked it out. CSA_EVENT_COMBINED_TEXT and CSA_EVENT_LARGE_TEXT have been merged into CSA_CATEGORY_LARGE_TEXT, CSA_EVENT_SMALL_TEXT has become CSA_CATEGORY_SMALL_TEXT, and as stated in the patch notes there's CSA_CATEGORY_MAJOR_TEXT and CSA_CATEGORY_COUNTDOWN_TEXT which are new. Anything I've missed?