Please note that this release contains a significant adjustment to the functionality for the context inline editor. No longer is it necessary to place the inline editor block, instead the editing interface should be accessible via contextual links on any block element.
#1238580 by tekante, mukhsim: Context edit form does not assign block weights properly.
#1720412: A reaction plugin without function options_form results in WSOD
#1154908 by johnbarclay: context_reaction_block.inc doens't load blocks as drupal core does, creating inconsistent behavior
#1124544 by wapnik, tcmug, hctom, idflood, febbraro: i18n conflict - Menu reaction doesn't have any effect
#1670392 by Sheldon Rampton: Better documentation for creating Drupal integration points
#1297776 by tekante, bensey: Blocks missing from reactions when context layouts is enabled.
#1439134 by jamesharv, clarew: Error when saving context - unable to define weight
#1050724 by jec006, e2thex, tirdadc: revamp of the context_ui inline editor behavior to remove the need to place the inline editor
#1076706 by tekante, mortendk: Corrected issue where menu blocks are dropped from contexts when using the inline editor
Also please see issues marked as D7 stable release blocker and comment on patches, debate whether they should be considered a blocker and lobby for items you feel are missing from the release blocker list.