dsyleixa, I agree with you about what you wrote about 3D gyroscopes and calculating yaw angles as well, and I have to disagree with jremington's statements that it shoudn't be possible. Unfortunately I have no personal experiences with the MPU6050 though.
Having said that, I want to show you a link about a lib which claims to calculate both yaw, pitch, and roll, but as stated, I can't say anything about trustworthiness or interrupts if yes or no:
I hope that might help you further, or some other people can comment on this perhaps!