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The upward arrow seemed to imply that you were to swipe the circle upward to unlock, and the camera button functioned not like a button, but like a slider. At this point, I think Google was adding too much for that original lock screen design to handle. Google Now was also integrated into an upward facing arrow at the bottom.

As Android evolved, Google maintained the same overall design, but relocated the camera to a button in the bottom left, and allowed the user to drag the ring anywhere to unlock the phone. This solution didn't really have any issues, although I feel like the move away from the previous method of sliding right to unlock had more to do with legal pressure than anything else. With Ice Cream Sandwich Google settled on a design that was a lock symbol surrounded by a circle, which could be dragged to the right to unlock the phone, and to the left to open the camera. The Android lock screen has gone through a number iterations over the years.