For a while I have been waiting for Colt to a announce a ultra-reliable ultra-high capacity magazine that will accompany the Colt Infantry Automatic Rifle. One of the requirements for the Marine IAR is a ultra-high capacity magazine.
At the Pakistan IDEAS-2008 expo an M16/M203 was on display with a MWG 90 Rounder High Capacity Magazine, sitting directly above a Colt IAR poster (Photo by skybolt @ Defence.pk).

The tan colored weapon on the poster is the Colt IAR. Click to expand.
I think it would be safe to assume that Colt is going with the MWG 90.

MWG 90 Rounder High Capacity Magazine
If you look closely at the first image it appears that the MWG 90 magazine is attached to the M16 upper receiver. Something is attached to the receiver which extends towards the magazine. Anyone know what this is? It does not appear visible on MWG promotional photos, such as this one:

Colt may have customized the MWG 90 to increase reliability/durability.
Wow! Ruger has finally decided to sell a Mini-14 with a 20 round factory magazine!

NRA Mini-14 Rifle:
Chambered in the popular and proven .223 Rem. cartridge and shipped with two 20-Round magazines. (Note: 20-round magazines are not available in all states and locales; 5-round magazines are available where required to meet state and local regulations limiting magazine capacity.)
Ruger are finally getting their act together!
Ruger has resisted putting in high capacity magazines since Mr Ruger wrote a letter to Congress
“The best way to address the firepower concern is therefore not to try to outlaw or license many millions of older and perfectly legitimate firearms (which would be a licensing effort of staggering proportions) but to prohibit the possession of high capacity magazines. By a simple, complete, and unequivocal ban on large capacity magazines, all the difficulty of defining “assault rifles” and “semi-automatic rifles” is eliminated. The large capacity magazine itself, separate or attached to the firearm, becomes the prohibited item. A single amendment to Federal firearms laws could prohibit their possession or sale and would effectively implement these objectives.”
And then stated on an NBC interview that:
“no honest man needs more than 10 rounds in any gun…” and “I never meant for simple civilians to have my 20 and 30 round magazines…”. It has long been Ruger’s policy to limit sales of those items to Law Enforcement or Military purchasers”
Ruger: Welcome to the 21st century.
More here.