differences between T61 sizes

Other then the obvious screen size difference I can't really seem to find what is different between the 14.1w, 14.1, and 15.3w versions. Anyone know what they are?

Seems like the camera is only avalible on the 14.1w version as thats the only one I can configure with one on the lenovo web site. And looks like UWB is only on the 15.4w from what I read here. Are there other differences?

What I found so far:
From ftp://ftp.software.ibm.com/pc/pcinstitute/psref/tabook.pdf it seems like the 4:3 screen is much worse, and the specs are worse screen then my 14.1" Dell sxga screen from a 2001 inspiron at 150nits and 250:1 contrast (I was hoping for better technology in 6 years...).
14.1" (358.1mm) SXGA+ (1400x1050) color, 150 nits, 4:3 aspect ratio,200:1 contrast ratio
14.1" (358.1mm) WXGA+ (1440x900) color, 200 nits, 16:10 aspect ratio,300:1 contrast ratio
15.4" (391mm) WSXGA+ (1680x1050) color, 200 nits, 16:10 aspect ratio,500:1 contrast ratio

sizes/weight/battery:
14.1" models (WxDxH): 12.3" x 10.0" x 1.1-1.3"; 313mm x 255mm x 27.5-32.4mm 6 cell 5.3 lb (9cell 5.6) 6-cell: up to 4.0 hr; 9-cell: up to 6.0 hr;
14.1W" (WxDxH): 13.2" x 10.2" x 1.09–1.26"; 335 x 261mm x 27.6–31.9mm 6 cell starting at 5.3 lb 6-cell: up to 3.8 hr;
15.4" models (WxDxH): 14.1" x 10.0" x 1.2–1.4"; 358.4mm x 255mm x 29.8–34.5mm 6 cell starting at 5.9 lb 6-cell: up to 3.9 hr; 9-cell: up to 5.9 hr;

Why would the 14.4w have better battery life then the 14.1w?

So I kind of like the 4:3 screen size but rather have a better quality display which leads me to the 15.4w but I kind of want the built in web cam.

 

More searching seems to indicate that the camera is only for the 14.1w model. But then does that just mean since they have a shortage in cameras (the reason they give for the delay in shipping) they don't want to make the shortage worse by putting it on more laptops (like the atheros based 802.11n card) or they really have no plan to put the camera in the laptop?