http://wiki.ecmascript.org/doku.php?id=harmony:specification_drafts#may_22_2014_draft_rev_25 

This is mostly a lot of resolved bugs.
 Other changes include:

Added Content of 8.5 Initialization (of the ES execution environment)
Additional cleanup/refactoring of Realm initialization
Changed Object.prototype.toString default result for Proxy objects
Made toMethod work for bound functions
Made comprehensions do 0 iterations if value of for-of expression is undefined or null to be consistent with for-in/of statements.
Strengthened restrictions on use of ‘yield’ in arrow function parameters. See bug 2732.
%TypedArray%.prototype.byteLength/byteOffset/length now return 0 instead of throwing if the underlying ArrayBuffer has been neutered.
Added host defined data to PendingTask records and host hooks into Enqueuing and dispatching Tasks.
Legacy octal escape sequences (Annex B.1.2) are not allowed within template string literals.
Resolving thenables runs in a separate Task
Resolved bugs: 2882-2881, 2878-2877, 2874-2870, 2867-2866, 2864, 2862-2860, 2857-2854, 2851-2839, 2837, 2835, 2833-2832, 2830-2829, 2826-2821, 2817-2813, 2810-2804, 2802, 2801-2797, 2793, 2790-2779, 2776-2769, 2767-2756, 2752-2735, 2733-2731, 2725, 2706-2695, 2692, 2689-2688, 2686, 2675, 2671, 2656-2655, 2604, 2596-2595, 2574, 2545-2538, 2535-2532, 2530-2528, 2523, 2520, 2505, 2502, 2499, 2497, 2485, 2480, 2468, 2466, 2464, 2462, 2460, 2459, 2455-2454, 2451-2450, 2448-2446, 2444, 2438, 2434-2432, 2430-2428, 2426, 2422, 2402, 2399, 2394, 2392-2391, 2387, 2369, 2365-2364, 2358-2355, 2351, 2349, 2346, 2344, 2336, 2334, 2330, 2327, 2321-2318, 2316, 2313-2307, 2304, 2294-2293, 2288, 2276, 2265, 2263, 2224, 2223, 2219-2216, 2214, 2210, 2132, 2114, 1929, 1353, 811

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http://wiki.ecmascript.org/doku.php?id=harmony:specification_drafts#may_22_2014_draft_rev_25 

This is mostly a lot of resolved bugs.
 Other changes include:

- Added Content of 8.5 Initialization (of the ES execution environment)
- Additional cleanup/refactoring of Realm initialization
- Changed Object.prototype.toString default result for Proxy objects
- Made toMethod work for bound functions
- Made comprehensions do 0 iterations if value of for-of expression is undefined or null to be consistent with for-in/of statements.
- Strengthened restrictions on use of ‘yield’ in arrow function parameters. See bug 2732.
- %TypedArray%.prototype.byteLength/byteOffset/length now return 0 instead of throwing if the underlying ArrayBuffer has been neutered.
- Added host defined data to PendingTask records and host hooks into Enqueuing and dispatching Tasks.
- Legacy octal escape sequences (Annex B.1.2) are not allowed within template string literals.
- Resolving thenables runs in a separate Task
- Resolved bugs: 2882-2881, 2878-2877, 2874-2870, 2867-2866, 2864, 2862-2860, 2857-2854, 2851-2839, 2837, 2835, 2833-2832, 2830-2829, 2826-2821, 2817-2813, 2810-2804, 2802, 2801-2797, 2793, 2790-2779, 2776-2769, 2767-2756, 2752-2735, 2733-2731, 2725, 2706-2695, 2692, 2689-2688, 2686, 2675, 2671, 2656-2655, 2604, 2596-2595, 2574, 2545-2538, 2535-2532, 2530-2528, 2523, 2520, 2505, 2502, 2499, 2497, 2485, 2480, 2468, 2466, 2464, 2462, 2460, 2459, 2455-2454, 2451-2450, 2448-2446, 2444, 2438, 2434-2432, 2430-2428, 2426, 2422, 2402, 2399, 2394, 2392-2391, 2387, 2369, 2365-2364, 2358-2355, 2351, 2349, 2346, 2344, 2336, 2334, 2330, 2327, 2321-2318, 2316, 2313-2307, 2304, 2294-2293, 2288, 2276, 2265, 2263, 2224, 2223, 2219-2216, 2214, 2210, 2132, 2114, 1929, 1353, 811