The bundled extensions in the download are:

• eZ Online Editor 5.0.3 (based on tinymce, which has RC status now)
• eZ OpenOffice.org extension 2.4.0

During the setup wizard, updated versions of eZ Publish Website Interface or eZ Flow can be selected which also install the follwing extensions:

• eZ Website Toolbar (separated from eZ Web site
• eZ JS Core (base library for client side javascript and Ajax functions)
• eZ Star Rating (based on a contribution by Bruce Morrison)
• eZ Google Maps Location (contributed by Joe Kepley)

The main new kernel features are

• A new cluster file handler, which can be used with distributed filesystems such as NFS
• Improved LDAP support
• Full PHP 5.3 compatibility

Other extensions related to 4.2.0alpha1 available are

• eZ Find 2.1alpha1
• eZ SI 1.2.0
• eZ Survey 2.1alpha1

Downloads and changelog

You can find downloads here

The full changelog is available here.

Notes on backwards compatibility

INI setting changes

image.ini
  [AnimatedGIF]
  DisallowedFilters[] defaults to empty
  AllowedFilters[] defaults to geometry/*
  This change is to ensure that animated GIFs can be resized using default settings. 

Change of behaviour

• eZLDAPUser::loginUser

  ldap.ini setting LDAPFollowReferrals is introduced and set to 0 by default as LDAP code did not work with most AD setups. LDAP_OPT_REFERRALS was earlier notset at all, thus enabled.

• User / Forgotpassword

  Links in the mail generated by the user/forgotpasswordmail.tpl template will no longer have the hostname prepended to them. This must be handled in the template. The change was done in order to be consistent with other emails sent by eZ Publish.

Renamed methods

• eZSoapRequest::namespace() -> eZSoapRequest::ns()

  Renamed for php 5.3 support, see issue #13825

Upgrading

Upgrading from earlier releases is not recommended yet, but if you want there is a database upgrade script needed which you can find under update/database/<db type>/4.2/unstable

Caveats

Please note that not all ez.no download related pages are updated yet