According to the screenshots, the spotlight icon is no longer on the top right, getting shuffled over to the left by presumably a new icon to invoke notification center.
That's a really bad choice. The corners are the click targets fastest to reach (see http://en.wikipedia.org/wiki/Fittss_law ), and demoting searching in favor of 'reading messages that have popped up before' doesn't strike me as quite well-balanced.
It looks like the two fingers have to come in from the right side of the scroll area (like pulling down on the top of the screen--the right side in this case), so it's distinct from the other meanings.
That's a really bad choice. The corners are the click targets fastest to reach (see http://en.wikipedia.org/wiki/Fittss_law ), and demoting searching in favor of 'reading messages that have popped up before' doesn't strike me as quite well-balanced.