Thanks to tipster Nathan, DAC has a bullet-pointed summary of the important bits from a Fallout: New Vegas preview out of the UK XBox 360 World magazine. Some of you might already know about a lot of the stuff in the article, but for those who don't - read on:
The tagline says: "A Safe Bet for RPG Fans"
Hardcore mode: Stimpaks take a long time to heal, you need a Doctor's Bag to heal broken limbs, and you suffer from Dehydration so you need to carry water.
Dynamite is one of the first weapons you come across
Obsidian have focused much more on the story than Bethesda did with Fallout 3
VATS now includes a special attack for every weapon
Weapons can be modded - one of the mods involves reducing the spooling time for miniguns.
All of your skills can be used to influence dialogue
A "Command/Companion Wheel" gives you control over your followers - the design of this isn't finalized yet
Nightkin are back and can cloak
The Hoover Dam is intact and produces electricity
Electricity seems to be one of the main things in the game
There are 3 factions - the NCR, Caesar's Legion, and (although unconfirmed) the Brotherhood of Steel
The Helios One solar tower controls an orbital laser platform
You can get a portable controller for the laser platform and use it throughout the game
Lots of "grey areas" in terms of actions and dialogue - a combined reputation and morality system means everything you do has an effect on something in one way or another.
New Vegas will have different endings, "instead of the single, potentially anachronistic 'man/woman saves the Wasteland' finale."
The overall theme of the game is about trying to find out who tried to kill you and why.
New weapon - The "All-American" - a rapid fire Sniper Rifle