You do like this:
[CCRepeatForever actionWithAction:
[CCSequence actions:
[CCShow action],
[CCDelayTime actionWithDuration:1.5],
[CCHide action],
[CCDelayTime actionWithDuration:5.0],
[CCShow action],
[CCDelayTime actionWithDuration:3.0],
// I would like to change the sprite image here before completing the remaining actions.
[CCCallBlockN actionWithBlock:^(CCNode*node){
CCSprite *spritN = (CCSprite*)node;
//[spritN setDisplayFrame:[cache spriteFrameByName:@"newSpriteImage.png"]]
CCTexture2D* tex = [[CCTextureCache sharedTextureCache] addImage:@"newSpriteImage.png"];
CGSize texSize = tex.contentSize;
CGRect texRect = CGRectMake(0, 0, texSize.width, texSize.height);
CCSpriteFrame* frame = [CCSpriteFrame frameWithTexture:tex rect:texRect];
[spritN setDisplayFrame:frame];
}],
[CCMoveTo actionWithDuration:2.0 position:newSpritePos],
[CCHide action],
[CCDelayTime actionWithDuration:2.0],
nil]];