Yeah, I was also caught off guard with this new app version, and thought you just couldn't filter anything any longer. I really don't feel like it's a great design to have a whole bunch of features hidden in an area that the app gives you no indication contains anything by default. My first impression isn't to try dragging all the edges of the screen to see if there are any weirdly hidden features, but rather, "Oh, damn, they removed all the most useful features. That sucks."
At least make it an expandable menu, or put a pull-tab there to give the user a hint that what they're looking for is hidden at the top of the screen.