Originally posted by: vss1980
Pffft, will not make too much difference in some ways. Any HL1 players out there will know that Valve have changed the net code and other things so much during HL1's lifespan that HL2 will be heavily modified in its lifetime. To put it bluntly, the Half-Life 1 that was released 5 years ago looks different, works differently, and plays differently to how it does now as far as online gaming goes.
The big deal as far as I see it in terms of gameplay is cheats, but new netcode patches and small changes to the game engine will fix this. In terms of money, it may cost Valve a bit, especially if some game company decides to re-engineer the engine so that it's different, but ultimately they haven't made many changes in terms of function.
I can see this being pushed as an excuse for its late release soon enough, but I don't see why the leaking of the source code would slow them down...... it's not something they really can / have to react to. I'd rather see the game out the door than see it held back so that they change something that works for no reason at all.