Since yesterday (15th April 2015) the latest Oracle Application Express (APEX) release 5.0 is available for download.
APEX 5.0 can be found under http://www.oracle.com/technetwork/developer-tools/apex/downloads/index.html
The new APEX 5.0 is supported for all Editions of Oracle Database 126.96.36.199 or higher, even Oracle Express Edition 11g (XE) can be used for the new APEX 5.0
dbi services blog: all about database infrastructures. dbi services - infrastructure at your service.