Yes. They were shown frequently in the "Be the Weapon" trailer.
Here's a gif
http://dl.dropbox.com/u/12527604/crysis/pictures/C2_BeFast.gif
That's cool

What program do you use to create animated gif's like that?
I didn't make that gif. Though I have made them before by:
-Downloading the video, rapidly taking screenshots with FRAPS, importing the frames into GIMP, resizing them and exporting them as an animated gif
-Downloading the video, cropping it with Windows Movie Maker and uploading it to a website that converts it for you.