Seeing the final product the way it turned out with the shiny finish, it looks to be the definitive Threepio.
And if it is, then Sideshow has made a huge mistake in how it's handling this release.
If this is indeed the only 1/6 version of Threepio we'll ever see, directly or indirectly from Sideshow, then they needed to "sell" it better. They needed to go all out with the advertising. They needed to come into this thread and answer the questions head-on on whether this is an official Sideshow figure and not just a sub-license. Or at least have an official statement clarifying this. We all have some doubts about whether we will or won't see another release from Sideshow down the line, and I'm pretty sure they know this. After all, they teased about doing a 1/6 Threepio for years! If this is it for Threepio, they need to be up front about it. Otherwise, they risk people (like me) holding out for a future "official" Sideshow release of Threepio, and they miss out on my purchase.
However, if this is not the one and only official Sideshow Threepio, then they need to say this as well. And they are also sabotaging their future Threepio release. This Bandai figure is great, and no-one is going to want an inferior version if Sideshow doesn't pull off a home run with their version. They would have to not only match how good this Bandai figure is, but improve on it and have tons of accessories, while still coming in at a lower price point.
I'm just trying to rationalize not buying this.