Your chances don't look good at all (unless you're willing to up-fare to full W class, in which case there is 1 seat left) -- can you fly out of JFK instead?
I am booked on BA174 in W, and my TA keeps claiming that going out of EWR will be more expensive (I am restrained by the comnpany budget). Wierd... Can it be that W out of EWR is pricier than out of JFK on the same day and (almost) the same hour?
Thanks!