Early Adopter 2 for version 4.2 was relesed for both Oracle SQL Developer
http://www.oracle.com/technetwork/developer-tools/sql-developer/downloads/sqldev-ea-42-3211401.html
and Oracle SQL Developer Data Modeler
http://www.oracle.com/technetwork/developer-tools/datamodeler/downloads/dm-ea-42-3215768.html
These releases are mostly bug fixes for EA 4.2.
Here is very briefly what is new in SQL Developer 4.2:
http://www.oracle.com/technetwork/developer-tools/sql-developer/sqldev-newfeatures-v42-3211987.html
and in Data Modeler 4.2:
You can learn more about the new features in Data Modeler 4.2 by reading my previous posts about the topic :
https://helifromfinland.blog/2016/09/27/whats-new-in-data-modeler-ea4-2-part-1-design-rules/
https://helifromfinland.blog/2016/09/28/whats-new-in-data-modeler-ea4-2-part-2-change-requests/
https://helifromfinland.blog/2016/09/29/whats-new-in-data-modeler-4-2ea-part-3-a-view-and-a-query/
https://helifromfinland.blog/2016/10/09/whats-new-in-data-modeler-4-2ea-part-9-end-of-the-serie/
https://helifromfinland.blog/2016/12/10/new-reports-in-data-modeler-4-2ea/
Go and Download!
P.S. APEX 5.1 is also out!
http://www.oracle.com/technetwork/developer-tools/apex/downloads/download-085147.html