Date: May 2014
Yes.
The latest production release of SQL Developer is supported by Oracle Support for any customers with support for the database they are using SQL Developer against. If customers encounter bugs in earlier releases that are fixed in a later release, they will be encouraged to upgrade to the latest release. Users are encouraged to log any issues through Oracle Support.
No, the Early Adopter releases of SQL Developer are not supported. Users are expected to upgrade to a production release.
Yes. SQL Developer is certified to run against XE. Please note that XE is only supported through the XE OTN Discussion Forum, so this is the only form of support available when running against XE.
Oracle SQL Developer is certified to run on the supported Oracle Databases. See Certifications for details on release versions.
Yes, Oracle SQL Developer is available in Oracle JDeveloper 11g.
Yes, Oracle SQL Developer will continue to be a standalone tool.
Yes, Oracle SQL Developer is shipped with Oracle Database 12c and will continue to be shipped with the database in the future.
Yes, starting from Oracle SQL Developer 1.5, Oracle TimesTen In-Memory Database is supported.
Yes, starting with Oracle SQL Developer 3.0, there is a free Oracle Data Miner extension to SQL Developer.