In case you missed it, Snapchat has added a few new video filters to their app. You'll find them the same way that you find the current speed or time filters. Just swipe your screen to the left or to the right.
The new filters that have been added are for slowing down video, speeding up video, or reversing video. There isn't a whole lot to explain about them as they are fairly self explanatory. The slow down has a snail icon, the speed up has a rabbit icon, and the reverse three arrows pointing to the left.