from the commit message: Added a popSceneWithTransition function. Its use is as follows: [[CCDirector sharedDirector] popSceneWithTransition:[<transition type here> class] duration:<float value here>]; code snippets from <www.cocos2d-iphone.org/forum/topic/1076>.

CCDirector.h

- (void) popSceneWithTransition: (Class)c duration:(ccTime)t; 

CCDirector.m

- (void) popSceneWithTransition: (Class)transitionClass duration:(ccTime)t
{
    NSAssert( runningScene_ != nil, @"A running Scene is needed");
    
    [scenesStack_ removeLastObject];
    NSUInteger c = [scenesStack_ count];
    
    if ( c == 0 )
        [self end];
    else {
        CCScene* scene = [transitionClass transitionWithDuration:t scene:[scenesStack_ objectAtIndex:c-1]];
        [scenesStack_ replaceObjectAtIndex:c-1 withObject:scene];
        nextScene_ = scene;
    }
}