Tim Gerritsen said:
Though we very much wanted to include online authentication for the retail release of Prey, we made the very recent decision to remove it due to technical difficulties in implementing it in time for our public release. Therefore we will not be including any online authentication with the retail release of Prey. This does not in any way affect and has nothing to do with our commitment to release Prey through online digital distribution via the Triton streaming system. Both the online demo and the final release of Prey will be available via Triton.
There you have it.