As always, these are not FINAL bits, but preliminary results for QE & community testing. Not for use by customers or end users. 

Update site: http://download.jboss.org/jbosstools/mars/staging/updates/

Target platform: 
* http://download.jboss.org/jbosstools/targetplatforms/jbosstoolstarget/4.51.0.Final 

New + noteworthy (subject to change): 
* https://github.com/jbosstools/jbosstools-website/tree/master/documentation/whatsnew
* http://tools.jboss.org/documentation/whatsnew/

Schedule: https://issues.jboss.org/browse/JBIDE#selectedTab=com.atlassian.jira.plugin.system.project%3Aversions-panel

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Additional update sites:
* http://download.jboss.org/jbosstools/mars/staging/updates/core/4.3.0.CR1a/
* http://download.jboss.org/jbosstools/mars/staging/updates/coretests/4.3.0.CR1a/

Discovery sites:
* http://download.jboss.org/jbosstools/mars/staging/updates/discovery.central/4.3.0.CR1a/
* http://download.jboss.org/jbosstools/mars/staging/updates/discovery.earlyaccess/4.3.0.CR1a/

Build folders (for build logs & update site zips):
* http://download.jboss.org/jbosstools/mars/staging/builds/



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Changes prompting this respin-a are:

https://issues.jboss.org/issues/?jql=labels%20in%20%28%22respin-a%22%29%20and%20%28%28project%20in%20%28%22JBDS%22%29%20and%20fixversion%20in%20%28%229.0.0.CR1%22%29%29%20or%20%28project%20in%20%28%22JBIDE%22%2C%22TOOLSDOC%22%29%20and%20fixversion%20in%20%28%224.3.0.CR1%22%29%29%29

To compare the upcoming version of Central (4.3.0.CR1a) against an older version, add lines similar to these your eclipse.ini file after the -vmargs line for the appropriate version & URLs:
 -Djboss.discovery.directory.url=http://download.jboss.org/jbosstools/mars/staging/updates/discovery.central/4.3.0.CR1a/jbosstools-directory.xml
 -Djboss.discovery.site.url=http://download.jboss.org/jbosstools/mars/staging/updates/
 -Djboss.discovery.earlyaccess.site.url=http://download.jboss.org/jbosstools/mars/staging/updates/discovery.earlyaccess/4.3.0.CR1a/
 -Djboss.discovery.earlyaccess.list.url=http://download.jboss.org/jbosstools/mars/staging/updates/discovery.earlyaccess/4.3.0.CR1a/jbosstools-earlyaccess.properties

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Nick Boldt :: JBoss by Red Hat
Productization Lead :: JBoss Tools & Dev Studio
http://nick.divbyzero.com