Looking at closely at the hi res pictures
, it looks like we will be getting at least these pieces:
1x2 plate with female joint on the end
1x2 plate with male joint on the side (for sure it's 1x2 on the red guy - there may be a 2x2 plate with joint on the yellow guy)
1x2 plate with female on one end and male on the other
1x2 plate with female on both ends
For completeness I would expect to see a 1x2 plate with female joint on the side (and maybe a 2x2 version - see my note on the male joint plate above) and a 1x2 with male joints on both ends. I'm already imaging all of the great ways these could be used. It looks like if you put two of these together, you could rotate the one piece about +/-90 degrees along the long axis of the ball joint, and about +/-30 degrees along the axis perpendicular to the ball joint.
According to Bricklink, that 1x1 eye piece has appeared in three sets
. When I saw pics of that exclusive duck set I assumed those were stickers, but I guess not. I'm unfamiliar with either of those basic brick sets from this year, but they look like pretty good values. Hmm, maybe they are not yet available in the US? The 2x2 round eye tile seems to be new (and that fig is screaming out to be made in lime green with short legs to be Mike Wazowski), as does the printed 2x2 ball joint.