Game's not ready, but FD will say it is, and everybody who hasn't experimented with the beta will be just as confused as we are now.
Meanwhile FD will be on the British extended holiday of at least a full week Christmas to New Year. Servers will go down, and somebody has to come into the office to fix it at an unearthly hour, meanwhile the bug reports will extend into multiple pages without answer until the first week of January.
Then an update is issued.
But to answer OP, they have to issue the game in time to sell new paint jobs in the 12 days leading up to Christmas.