The current Apex Statement of Direction for Apex 4.1 states that it will "include themes and HTML templates suitable for smart phones and mobile devices".
If you are wondering what that means, then check out this thread on the Apex OTN Forum where Marc Sewtz, one of the developers on the Apex team, provides more details about this new feature.
Interestingly, some of these "mobile-enabling" features are also relevant for regular applications, such as the ability to render a form without a table grid, enhanced label templates, and dynamic (SQL-based) lists.
