• Add implementations and fixes ArrayBuffer, DataView, all typed arrays constructors with all static and prototype methods. Really hard point. Typed Arrays #90
• Improve collections polyfills - O(1) and prevent possible leaking with frozen keys, correct observable state for object keys, WeakMap w/ frozen keys and garbage collection #134
• Add {keys, values, entries, @@iterator} methods to all DOM collections which should have iterable interface or should be inherited from Array
• Add basic support rejectionHandled event / onrejectionhandled handler to the Promise polyfill
• Rename String#{padLeft, padRight} -> String#{padStart, padEnd}, proposal, November TC39 meeting (they want to rename it on each meeting?O_o), Update padLeft/padRight to be padStart/padEnd, #132
• Add String#{trimStart, trimEnd} as aliases for String#{trimLeft, trimRight}, proposal, November TC39 meeting
• Add System.global, proposal, November TC39 meeting
• Add Error.isError, proposal, November TC39 meeting
• Remove usage @@species from Promise.{all, race}, November TC39 meeting
• Check changes by meeting notes
• Add Math.{iaddh, isubh, imulh, umulh}, proposal
• Move RegExp.escape from es7 to non-standard core namespace, July TC39 meeting - too slow, but it's condition of stability, Remove RegExp.escape #116
• Add annex B HTML methods - ugly, but also the part of the spec
• Add little fix for Date#toString - new Date(NaN).toString() should be 'Invalid Date'
• Remove core.log module
• Remove Mozilla Array generics - deprecated and will be removed from FF, looks like strawman is dead. Available alternative shim.
• Change $ prefix for internal modules file names because (holy shit!) Team Foundation Server does not support it, "$" symbol in file names #129 (please, don't use core-js internal modules in your scripts!)
• Move custom build from external scripts to the separate package for preventing problems with dependencies, some changes in that API
• Add entry points for virtual methods
• Add entry points for stages proposals

...and if the situation does not change, it can be the last big release :(