mpl2.0b3 (and likely ever since get_cursor_data exists).
The PcolorImage class does not redefine the get_cursor_data method, so it displays incorrect cursor data:

In [1]: plt.gca().pcolorfast([0, 1, 3], [0, 2, 3], np.arange(4).reshape((2, 2)))

then hover the cursor over the image to see incorrect values in the status bar.