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Is there some action you plan to take in the next few days, based on what you hear from people on this thread?
If not, then I would not worry about it. Not because the repo won't have an effect on your score, but because (a) there's nothing you can do about it (it will have whatever impact it's gonna have and your anxiety won't change that) and (b) whatever you hear from us will be very unreliable compared with the certain knowledge you can get in a week or two when it actually appears.
Ag0311 is right that we have no way of knowing. If your current derogs consist of a few Day 30 lates, then the impact will be huge. If you have a BK two years ago and five Day 90 lates in the laxt six months, the impact will be much smaller. The truth is, though, even if you had a scoring expert to sit down with you and go over all three of your reports carefully, he still might be off in his guesses. Wait and see may be the simplest thing to do.
Based on how dirty your file already is with multiple negative information and scores currently in the low 500's, you probably won't see a huge score decrease when this next baddie shows up. Sure your scores will go down, but it won't be remotely to the degree that they'd drop if your scores were much higher to begin with.
If I were you I'd stress out much less about the scores and simply put together a plan to start cleaning up those negative items. I suggest hitting up the rebuilding forum to connect with others that are either in your shoes right now, or have been recently that can point you in the right direction.