The Odoo13 is expected to release by this October, there are lot of changes in odoo13, so we can have look at it one by one.

1. Website form builder is moved to Community: https://www.youtube.com/watch?v=o3WGNq4i344

2. Sales Coupon and Promotion module is moved to Community: https://www.youtube.com/watch?v=JF5JYktZV3E&t=18s

3. List View Improvements like mass editing in the list view, group by enhancement like, new button in group by etc, see-> https://www.youtube.com/watch?v=J9NNVrAc9Us&t=16s

---> 3.1 grouped list views are now editable -

---> 3.2 'expand' attribute can be used to open by default the first level groups

---> 3.3  if there are a lot of groups, a pager is displayed (instead of having all groups in the same page)

---> 3.4 when grouped on a many2one field, custom buttons (on the many2one comodel) can be inserted in each group's header

---> 3.5 we can edit several records in a row in editable list views

---> 3.6  editable lists do not flicker anymore when switching a row to edit mode

---> 3.7 we can navigate through the cells in list views with the arrows (in readonly)

4. New Module named HR Skills is added for Managing Employee Skills : https://www.youtube.com/watch?v=E09XNr7hhYE

5. Leave is Renamed to Timeoff in Odoo13 : https://www.youtube.com/watch?v=g08_hJuTuNA

6. Easily Open the Groups, Access Control List and Record Rules by clicking newly added smart buttons in Users form: Open Record Rules and Access Rights Easily in Odoo13

7. New Search Panel is Introduced in the Kanban View, easily filter the records using the new search Panel, see the working here : New Search Panel in Odoo13 Kanban View

8. Login to POS UI as Employee instead of as User: Point of Sale Login With Employee Odoo13

9. HR Payroll is moved to Enterprise Edition: HR Payroll is Removed from Odoo13 community Edition

10. Easy to switch, add/remove company access.

11. It seems as in Odoo 13 will replace wkhtml2pdf by chromeheadless:  https://github.com/odoo/odoo/pull/32624

12. More flexibility with your components' consumption. Define on your BoM if you can consume more or less components than planned (works for Manufacturing Orders and Work Orders)

13. Chartjs will be available in Odoo V13. This will opens up a wide range of options for building statistics and more advanced portals out of the box. See PR: https://github.com/odoo/odoo/pull/31766

14.  Subcontracting

15. Rename 'Delivery Method' by 'Shipping Method'

16. Updates in Sales,

   --> fully inline
   --> cleaner column labels
    --> smart product configurator (just click on "Add a product")

    --> the user can choose which field to use
    --> advanced fields are optional (lead time, cost, route, analytic tag)

17. Odoo13 is running on jQuery 3.x

18. Showcase Product Videos on eCommerce: https://github.com/odoo/odoo/pull/32298

19. Instead of synchronous load, Odoo13 will have lazy loading for java-script files. Previously website pages appeared to the user when all the "css" and "js" were downloaded, parsed and executed but the "JS" is now lazy loaded. See:- https://github.com/odoo/odoo/pull/32181

20. After sales services. Manage refunds, returns, coupons, and repairs directly from your helpdesk tickets. Integrate your support teams with sales, accounting, project, and warehouse departments.

21. Generate and print return labels for all carriers. As well as additional improvements regarding delivery orders on the portal.

22. Access group terminology is misleading so all the "Manager" security groups' name have been renamed to "Administrator" in master branch to remove the confusion. See-> https://github.com/odoo/odoo/commit/ec07e72845a390cdf9cf72ebbbf4369ea92ecfbe

23. Display a timer on your work orders

24. New App Field Service Management

25. My Profile Option

26. Salespeople can now request leads as an In-App-Purchase service. Not enough leads? Press a button a get more!

27. New signature widget (binary field). Add signatures anywhere with Odoo Studio. Request signed confirmations in any process: on purchase orders, delivery receipts, etc

28. Tap to scan! Scan barcodes with your smartphone's camera to quickly search products or to process inventory operations. No need for an external scanner anymore. Use the barcode widget anywhere with Odoo Studio. Requires Odoo Mobile.  Widget: many2one_barcode

29. Print return shipping labels with FedEx.

30.  Request the upload of a document from a record with our new activity type!

31. Automatically detect employees presence based on activity.

32. The new improvements to the #Odoo V13. Slides module are taking shape.
New interface to the forum.

33. Set up an Out Of Office message on your leaves

34. Invoicing a sales order is now easier: better wording, option to deduct down payments only appears if needed.

35. Apply your very own branding (colors/font) to your document layout!

36. HTML editor support now Checklists

37.  the activity view will be improved and more features will be added such as opening the form directly, counters, activity time filters and much more.

38. New answer type 'date time' in Odoo Survey.

39. Payroll Planning

40. Manage online certifications with Odoo Survey. Test deadline, multiple attempts, on-screen timer, passing score, send and print certificates.