APEX 3.1.2 is now available for download and fixes the following bugs. You can get hold of it by either:
blog. As Joel says, if your upgrading from any APEX version pre-3.1, then you'll need to use the full OTN release (which includes the version that comes pre-installed with 11gR1).
For details on future plans, please take a look at our Statement of Direction, which was updated just under 3 weeks ago with details of the 'Forms Converter' of APEX 3.2 and 'Websheets', 'Updateable Interactive Reports', 'Extensible Item Framework' and much more of APEX 4.0.