The default Magento 2 code branch («develop») has now 2.3-dev version number since 2017-07-28

[dmitry_fedyuk (Dmitrii Fediuk)]

https://github.com/magento/magento2/blob/81a184e5/composer.json#L5-L5

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https://github.com/magento/magento2/commit/81a184e5

So Magento 2.3 development has started.

[dmitry_fedyuk (Dmitrii Fediuk)]

• Magento 2 team has changed the default Git branch from develop to 2.2-develop.
• How to clone the Magento 2.3 git branch (2.3-develop)?
• The develop and 2.3-develop git branches now contain an identical code