I'm asking me how we will start mods, wether it will be like Max Payne where you must choose your mod at the start menu or like Half-Life where you can do it in the game itself.
I hope it will be like HL, because it's the easiest way, it would be very silly if we have to quit the game every time when we want to change of mod.
But I don't know even if we will be able to change the ingame menus (the computer, the bloc-note where you can choose your mission or the other one with the briefing, ...). If we can't (what would be very regrettable), it have no sence that we speak about it, how will we start them.
I think you can think of Red Hammer as an addon, just click the tab i would think.
Red Hammer is only a campaign. There will be true mods. They will require the game to be "ready" for this. Else you'd have to replace all the files (original) with the mode files in order to be able to play a mod, which isn't very good.