concrete5 8.1.0 is now available. In addition to a bunch of bug fixes and minor improvements, this update adds the ability to the form block to use an existing Express object form, dramatically improves concrete5's time zone support and much more. 

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Full version notes are available here

Version 8.1.0 Release Notes

Additionally, new Express Object documentation (requiring 8.1.0) is also now available:

Programmatically Creating Express Objects

Creating, Reading, Searching, Updating and Deleting Express Object Entries