PHP 5.5 and 5.3 have reached end-of-life (EOL), and PHP 5.6 and 7.0 will reach EOL in December 2018 so upgrade to PHP 7.1 or 7.2 as soon as possible.
Pantheon release notes
PHP Updates
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PHP 7.2 MS SQL Support
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The platform-wide build of PHP 7.2 now supports connecting to an external Microsoft SQL server via sqlsrv functions. Your CMS should use Pantheon's default database, but this unlocks use cases that require connecting to an external MS SQL server.
Filemount Configuration
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Use the filemount configuration to modify the default location of Pantheon's cloud-based filesystem. For details, see Pantheon YAML Configuration Files.
The new Terminus Site Clone plugin makes it easier than ever to duplicate sites on Pantheon. For details, see Migrate Sites to Pantheon FAQs.
Documentation
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Drupal 8 and Composer on Pantheon Without Continuous Integration
Learn how to manage Drupal 8 using Composer with Pantheon.
WordPress Core Upgrade
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WordPress 4.9.5.1 has been pushed to all site dashboards.
This update improves Pantheon’s customization to WordPress login form. Click here for more information.
Site Auditor (aka RavenCrawler) can now access platform domains to support pre-release SEO testing. Please contact support if you would like to see other tools given this access.