A new insider we'll call FourthHandLuke shares some loose information about Episode III, centering on one tragic scene. Here's the scoop, consider it rumor until we can develop it more:

I have some information on the funeral scene in Episode III for you. I actually recieved the information along with details of some other scenes from a friend in early summer, probably around the time pre-production was finishing up, so I'm not too sure about how current it is. Though, I'd guess the general set-up is the same, so onto that...

The gathering is held on Naboo and the scene shouldn't take much longer than the wedding scene in Episode II. Among those in attendance are Sio Bibble, the Queen, some handmaidens, Padme's family, and the loyalists. This is confusing however, because from what I'm told, Bail is taking care to Leia and securing her hiding-place at this point, though I assumed Bail would be included with the Loyalists. So I'm not really sure as to if Bail is there or not. Oh well...back to the scene. The standard ceremonious pretty Naboo dosen't exist at all here, as you'd probably assume that it wouldn't in the context of a funeral.

By now, it's obvious that the Empire is in control, at least to the Loyalists, who are "in the know", it's not clear as to whether or not the Government on Naboo really understands the implications of the recent events yet, or more generally whether the general population of the Galaxy as a whole understand that they are on the brink of Imperial oppression.

While the focus of the scene is on the proceedings of the funeral there is a general tense feeling from those in attendance. Uncertainty and bracing for what's to come.

Now I can't vouch for the authenticity of anything after this because it's from a different source, but I've been suggested that Padme's death is used by the loyalists as almost a rallying point, or, more accurately, proof of their cause to garner support.

And as an aside, here's more info on the same subject from a couple of other sources:

Padme is carried to the graveside in a floating casket, much like the carbonite block carrying Han Solo on Cloud City.

The art was drawn up both ways - one with the casket open and the other simply closed. So we may get a glimpse of her lying inside of it all fixed up...yikes.

You can also see an "informed" vector rendering of the potential scene from TFN spy artist Anthony right here (spoiler).

Sounds promising ...