I highly doubt we will see new characters / weapons / infected for L4D1.
If anything I have a good feeling they will do 2 more bridging stories like CRASH COURSE. And that will be it. L4D1 will be forgotten.
Protip, buy something because you are satisfied with what is offered on day 1, and appreciate anything else that comes along afterward. Promises are not legal binding contracts. If so Peter Molyneux would be a poor man, after all the lawsuits for missing promised content.
Protip2, never buy anything at MSRP.
Protip 3 - Don't be a corporate puppet and let companies get away with lies. If you buy something because you trust a company that has made due on their promises before and they screw you, don't buy from them ever again.
Protip 4, I paid $49.99 for a game that's forgotten- I won't make the mistake of paying $44.99 for the sequel that will only be forgotten when Left 4 Dead 3 starts being worked on. Oh wait, they're already pre-selling that and Left 4 Dead 4.
I didn't even pay $49.99 for Episode 1 or Episode 2 and those offered more hours of gaming than Left 4 Dead did.
If this game were $19.99, I'd not be on the boycott wagon. Or maybe I would.
The thing is, in October 2008, no one had doubts that Left 4 Dead would have added characters, weapons or stages. We all believed it would happen because Valve said it would.
We would've been more than happy to rate Left 4 Dead as a standalone product, if that's what Valve proposed it as, but we rated it as a core structure. A game that was "Good" with room to grow. That's what it was rated as because when people asked Valve about it, Valve said that's why it was so short in the beginning.
Do you think if when Valve launched Left 4 Dead last year at $49.99, they would've sold as many copies as they did if Valve said "You get the 4 missions it came with, with only 3 of them available for Versus mode, and that's it"? I sure as hell wouldn't have picked it up. Neither would the other friends who bought it with me and the countless friends I made on the game. We set up groups, plans for the new campaigns, waited patiently.
We have every right to express how we feel about the game and if enough people are upset about it, they can form groups, make videos, do whatever. Just as much you have your right to not boycott it.