Sharp-eared reader Dexter Sy picked out something on the Official Site's first Episode 2 documentary. Consider the following spoilerish, so highlight to read...

SPOILERIn the "Making of Episode II" documentary, one of the scenes on tatooine about 2/3 of the way in, you could clearly hear Watto speaking as 3 hooded figures approach his store. Check it out.END SPOILER

UPDATE: Gale did some more studying into the documentary...

Besides the bit with Watto, you can also barely hear C-3P0 speaking to Artoo during the brief shots we are shown of the droids in Padme's cruiser. There also seems to be music behind the dialouge. (Has Williams done the score already or is this general music from the other films?). Note:There are two figures approaching Watto, Anakin and Amidala. The petite woman flanked by two security guards (note the Naboo type guard uniforms) is probably Corde, the handmaiden, and their descent onto the platform at Courasant where Corde is then killed in the first assasination attempt.

There is also a shot which seems to be in the revamped Jedi Council Chamber (mace Windu and another Jedi). They are probably discussing the assasination because we can see two handmaidens in black on the left. Also, near the cameras there seem to be a pile of scrolls?

Good stuff!