Microsoft has released Microsoft Endpoint Manager Configuration Manager build 2006 (MEMCM) via the opt-in method (fast-ring) on 8th of August, followed by slow-ring (GA) on 31st Aug.
If you want to install a new Configuration Manager site (fresh build), you can download the baseline version which is 2003 from the volume licensing portal, and then do an in-console update to 2006.
For more information about what’s new in Configuration Manager 2006, please refer https://docs.microsoft.com/en-us/mem/configmgr/core/plan-design/changes/whats-new-in-version-2006
And for a step-by-step guide to 2006, https://systemcenterdudes.com/step-by-step-sccm-2006-upgrade-guide/
Once you complete the CAS/Primary site server update, you need to manually upgrade any secondary sites by right-clicking on the site and choose the upgrade.
You also need to update your Configuration Manager clients to the latest version (2006) to avail the new client features that were added.
As usual, whenever there is a new configuration manager build released, there are always new SQL views for the newly released/updated features which will help us to generate custom reports without doing any MOF extensions (in case you have done it for these).
In Configuration Manager 2006, there are few SQL Views added compared to its previous version 2002 listed below for your reference.
Since the Technet gallery is retiring very soon, I have uploaded the Microsoft Endpoint Manager SQL Views for the build 2006 and also the previous builds to Github for your reference.
Download the SQL views for reporting from Github