(thanks flippy for moving)
Anyway. A while ago it was confirmed that Last light will have multiplayer and CO-OP(this was undecided at first but it has been confirmed)
Seeing as there are several factions (Rangers, Hanza, Communists, Fourth reich, stalkers, bandits and so on) this might be quite fun to see. I do hope however there will be a gamemode where you can spawn as mutants. Like snouts or liberian.
The CO-OP however is the Biggest anticipated by fans. And i have to say i to am very looking forward to this.
Also the Trade system of Metro 2033 will be retained. Aswel as the stealth system however it will be a bit updated.
Moral point system is retained, thus the game will have several endings
Gasmasks and stalking on the top will be retained
Another new thing i am VERY looking forward to, is the bolt action rifle
http://metro2033.wikia.com/wiki/Bolt-Action_RifleThis weapon is VERY intresting. It looks like a mosin nagant, but with a schmidt rubin K31 style straight pull system. Along with a side mounted 8 round magazine.
An unconfirmed rumour says that the reason why the game got rescheduled to 2013, is because 4A games and THQ wanted a longer campaign so that the game will have a better chance on the market. Sales of Metro 2033 was Very very well and profitable, thanks to steam sales and other actions.