The Contra series is celebrating its 20th anniversary with the release of a brand new game for the Nintendo DS.

Here's the relevant info on Contra 4:

• 2D side-scroller that uses both of the DS's screens. 
•  gameplay mechanics that "grant players deadlier abilities than ever before"
•  multiplayer functionality.
• 2007 release date

According to Konami:

"Contra 4 takes place two years after the events of Contra III: The Alien Wars. After saving earth from invasion by Red Falcon, Bill Rizer and Lance Bean are confronted with a new extraterrestrial menace: the terrifying Black Viper. Joined by hard-boiled mercenaries Mad Dog and Scorpion, the warriors must once again wage war against an entire army of invaders. "

And also:

"Refining the 2D side-scrolling genre the series established 20 years ago, Contra 4 delivers pure action at a fever pitch as players jump, shoot, and dodge oncoming hazards. Utilizing a new dual screen presentation, the action spans both screens of the Nintendo DS, giving players the opportunity to battle across expansive environments in which death can come from any direction. The use of both screens for the game's core action also allows for massive boss battles as players try to seek and destroy the weak points of sky-high enemies. A first for the series, Contra 4 introduces a grappling hook accessory that lets players grab onto elements of the environment directly above them. Whether using it to avoid oncoming dangers or attack from a strategic vantage point, the grappling hook allows for new combat situations and dramatic set pieces that underscore the game's adrenaline-soaked pedigree."

It's coming in 2007.