Just a brief note that Knockout 2.3.0 is now available. Additionally, there is a beta release of Knockout 3.0.0 available here. Steve Sanderson has a great post highlighting the features/fixes in 2.3.0 and the changes in 3.0.0 beta. I look forward to writing more about 3.0 changes in the coming months.

2.3.0 contains a ton of fixes and improvements. Here is a copy of the 2.3.0 release notes:

Features:

• hasfocus renamed to hasFocus (hasfocus will still continue to work as well)
• name parameter of template can accept an observable
• ko.unwrap added as substitute for ko.utils.unwrapObservable
• options binding uses same technique as foreach to avoid unnecessary re-rendering
• optionsAfterRender callback added to allow for custom processing of the added options
• optionsCaption will display a blank caption if the value is an empty string

Bugs fixed:

• hasfocus: requires two Tab presses to blur (and related issues) in Chrome; throws error in IE9 on initial binding
• Error when you try to inline knockout because of </script> string
• If first node in string template has a binding, the bindings in the template won’t get updated
• selectedOptions doesn’t update non-observable properties
• css won’t accept class names with special characters
• Applying binding twice to the same nodes fails in strange ways (now it fails with an obvious error message)
• Two-way bindings overwrite a read-only computed property with a plain value
• Empty template throws an error with jQuery 1.8+
• observableArray can be initialized with non-array values
• Event binding init fails if Object.prototype is extended (fixed all for...in loops)
• Calling ko.isSubscribable with null or undefined causes an error
• Binding to null or undefined causes an error
• Memory leak in IE 7, 8 and 9 from event handlers
• options binding causes error in IE8+ in compatibility mode
• value binding on select doesn’t match null with caption option
• Invalid element in string template can cause a binding error
• Conditionally included select gets close to zero width in IE7-8
• ko.toJS treats Number, String and Boolean instances as objects
• value binding misses some updates (1 -> "+1")
• Exception in ko.computed read function kills the computed
• Error if spaces around = in data-bind attribute in string template

Maintenance:

• Port tests to Jasmine
• Support Node.js
• Remove build output files and Windows build scripts
• Build script runs tests using build output (using PhantomJS and Node.js)
• Use faster string trim function
• Add automated multi-browser testing using Testling-CI