Multitasking on WP

Hey tribe

i was just watching the first lumia 920 review ( the one shot in the parking lot ) and was really dissapointed about the fact that WP still don't have multitasking...

i mean once you leave the app its not running any more, you have to relaunch it to access it again...

was that maybe because those apps that were tryed out of date ? or is it really a limitation within the OS ?