I think they are already planing on making aftermarket bumpers an option. I have used and enjoyed a front receiver hitch - it is not a huge deal to me. IF they allow flat towing, a bumper designed for connecting a toad hitch harness would be far more relevant to me.
I use a front hitch on our Tundra for maneuvering a trailer on and off a lift in our garage. The front hitch is critical for getting it in just the right spot, less than an inch of wiggle room. Would LOVE this option on the Terra.