Aftermath isn't out yet, so we can only speculate its outcome and whether or not you'll still be working for the G-man in Half-Life 3. I hope not, it seems a bit redundant IMO. Personally, I want you to rebel against the G-man. Maybe another higher being takes an interest in you and gives you the ability to fight the Gman (not kill him, cause that would be uncool, but escape his influence). Then maybe he grants you freedom in exchange for doing a task for him, as opposed to working for the gman with no return on your efforts. I want HL3 to take a radically different direction, so I'm like "whoa!, I wasn't expecting that".