An Update:
The new demo of Pinball Arcade on PSN has demo versions of Fun House and Circus Voltaire! I tried them out and it asked me if I want to buy them or just play the Trial Version. I tried out the trial version and wondered how many times I could play. It turns out you can play the Trial Version as much as you like., the only limit is when your score reaches a certain number it asks you to buy it or quit. But you can go back and start a new game as much as you like. This is a good system,
I was not going to buy Fun House and Circus Voltaire because I have played the ever living heck out of Fun House on Wii and PS3 (disc version from a couple of years ago) and plan to play it more on 3DS soon. So I was not going to buy it, but now I can at least try out Circus Voltaire as a demo to see if it grows on me enough to warrant buying both. I hope they do this with other upcoming table packs.