Shown below are some new images from NECA of their upcoming Left 4 Dead Boomer figure, possibly the grosses looking figure NECA has made to date. The Left 4 Dead figures won't be out till Spring 2012, but you can expect lots of articulation, even from this large fellow.
The Boomer is a bloated infected that can spit vision-impairing bile on the Survivors, attracting hordes of infected, and explodes on death, spewing more bile in the immediate area. They emit burping and vomiting like sounds when close by. A 5-note low piano cue plays to warn of the Boomer.
Oh and also here is a look at a work in progress image of the upcoming Smoker Zombie figure from the line. Now that's a face only a mother could love.