Slashfilm has posted them and adds some context to what you are seeing. Doesn’t this all feel like strenuous and enthusiastic foreplay? One wishes to “get it over with” already.
Hat tip to ONTD.
To put these images into some slightly speculative context (spoilers here, I guess) what you’re seeing is likely Worthington’s character Jake prior to arrival on Pandora, then Weaver, who plays one of the scientific leaders of the avatar program, and an administrator played by Ribisi, in the Avatar lab. The grizzled Lang is standing next to the creche that Jake (or any avatar participant) has to get into — basically a device that looks like a high-tech tanning bed — in order to transfer consciousness into a Na’vi avatar like the one seen in the first released production still.
We’ll have more on the film first thing tomorrow, as the trailer should be online around 10am EST / 7am PST. -Slashfilm