Specifically:
BUGFIX: IDAPython's choose.choose() was broken.
BUGFIX: calling idaapi.del_hotkey() twice with the same argument could crash IDA.
BUGFIX: IDAPython's IDC emulation of idc.GetTevRegMem() was not working.
BUGFIX: IDAPython: execute_ui_requests() could crash IDA.
BUGFIX: IDAPython: IDP_Hooks instances could prevent the decompiler from working properly
- Added AskUsingForm() with embedded forms support (check ex_askusingform.py example and formchooser.py in the SDK)
- Added idautils.DecodePreviousInstruction() / DecodePrecedingInstruction()
- Added idc.BeginTypeUpdating() / EndTypeUpdating() for fast batch type update operations
- Added more IDP callbacks
- Added UI_Hooks with a few notification events
- Added idaapi.process_ui_action() / idc.ProcessUiAction()
- Added netnode.index() to get netnode number
- Better handling of ea_t values with bitwise negation
- Execute statement hotkey (Ctrl-F3), script timeout, and other options are now configurable with Python.cfg
- bugfix: idaapi.msg() / error() and warning() so they don't accept vararg
- bugfix: processor_t.id constants were incorrect
- bugfix: get_debug_names() was broken with IDA64
- Various bugfixes