See Loginin's post above, it's still possible to swipe away from a bottom-up action, you just need to swipe higher. If you swipe up slightly less, then you will still get the quick launch bar. I'm not sure if it's really all that different from PR1.2, you never had to hold very long on PR1.2 to get the QL bar. I don't have a PR1.2 device to compare it with right now...