<optimism> Maybe it's going to be like they did with the browser. 1.1 brought semi-official keyboard shortcut that enables limited portrait mode, 1.2 will bring official rotation setting in menu and improved portrait controls. Will 1.3 bring official rotation to these apps? </optimism>
Honestly though, the uses are extremely limited without a portrait keyboard. I'd probably like to see a portrait media player most, it would be much more comfortable to use one handed.