[Bravada]

1. It is not an Opel - it appears to be smaller than the current Astra sedan (and similarly-sized Civic sedan), and also for Opel the sedan was somewhat of an afterthought. I expect the Chevrolets, once grown-up to be on par with global competition, to replace the likes of "Chevrolet Vectra" in Brazil and Astra Classic / Astra C sedan in New Europe and Opel to concentrate on "traditional" European market, which means no compact sedan.

Anyhoo, it would be strange to see Opel test sedan first before the hatch.

2. That said, the fact that they are using a dash design reminiscent of the "new Opel style" as seen in the GTC concept and new Insignia spy shots, leaves me worried - there might be too little differentiaton between Opels and Chevrolets (perhaps intentionally, for GM to be able to swap badges accross markets, but that's not something I like). I am also not a big fan of this huge hazard lights button (which should be red anyway IMHO)

3. The fact that the vehicle is still smaller than the most recent examples of the ever-growing compact sedan species gives a good argument to the Gamma theory IMHO. The, supposedly-Gamma-based, Grande Punto gave birth to a compact-sized Fiat Linea sedan, so...