This document discusses challenges for developers as devices evolve to have multi-dimensional and multi-sensual capabilities. It notes that while desktop dominated in 2008, mobile now accounts for 91% of usage in 2012. It predicts that as devices gain more sensors and interactions are not limited to touchscreens, the mobile device may disappear and every surface could convey information, with users' bodies themselves becoming interfaces. Developers will need to design for a higher complexity and potential with these new, sensor-based interaction models.