Comparing the list of callbacks in luatex 0.89 to those in 0.80 the changes seem to be
New - append_to_vlist_filter - hpack_quality - process_rule - show_warning_message Gone - pdf_stream_filter_callback - token_filter the first three new ones are documented in the manual but not show_warning_message the two that have gone are not documented anywhere as a change that I can find. This came up as a user query about some old code of Taco's on stackexchange using token_filter http://tex.stackexchange.com/a/21691/1090 What is the intended replacement for token_filter? David
