Most of the the weapon balancing will probably be done based on the original game balance. Further balances can probably be done by the custom match/server options. When it comes to the more wacky stuff like WW2 guns versus modern, that will be more dependent on the server settings.I love the idea of Portal, but just wonder how the hell will they manage to balance it with so many variables? Hoping for the best.
I'll spend most of my time in Portal playing the general "remade" matches from past games and don't it will be a big issue.