Sling, who specialise in taking your TV and shoving it right up your internet tube, are apparently set to release an updated version of their Slingplayer for Windows Mobile software this Spring, for both Pro and Standard (touchscreen and non-touchscreen) handsets.  The update will include better optimisation for newer WM smartphones.  According to the rumor, Sling will also release an optimised Nokia N95 8GB app and extend their Symbian variant to include UIQ devices.  Perhaps most exciting, though, is word that they’re evaluating the iPhone SDK with regards a Slingplayer client for the Apple cellphone.

How well streaming TV might work via AT&T’s EDGE network remains to be seen; current Sling implementations automatically adjust the video stream quality to take into account what bandwidth is available, and some users report successful use via 2.5G connections.  It seems unlikely that they’d do justice to the iPhone’s widescreen display, however.

More tricky, then, could be the Sling system’s use of WMV, rather than the H.264 format the iPhone currently supports.  It’s possible that an iPhone compatible service could require a new Sling box.