http://arstechnica.com/gaming/news/2009 ... to-ars.ars
seems like gabe wasn't a big fan of sequeling either... but well, seeing some more footage and plans for this, i can understand why this is a sequel. Don't forget steam can help with dynamic pricing so maybe there's a huge discount for L4D1 owners, which would make it basically price technically an addon if you change in the first two weeks(?)