its a joke dude...
In the December issue of Game Inofrmer it has an article about Bungie splitting away from Microsoft to become its own independent Developer so it can make more money
The GI staff proceed to ask if they can expect to see any Bungie licenses on other consoles and he jokingly says: "Well we certainly aren't talkinga bout doing Halo DS!" (insert his chuckle)
Halo will never come to the DS for a few reasons:
1. the IP is owned by Microsoft NOT Bungie
2. Microsoft wants all the money they can get...why giv away their biggest IP?
sorry to burst your bubble...but it aint hapnin