Considering all those abandoned and incomplete trade series from DC (most annoying ones, for me personally, were Robin, Shadow Of The Bat, Superman/Batman and Teen Titans by Geoff Johns) you can thank god for every series they actually manage to complete. They'll need four or five trades for Simone's complete BOP run. Let's see how many of them we'll see in the end.
Just remember the latest Superman/Batman trades, where these clowns actually managed to release exactly six trades - out of seven, that would have been necessary to collect the complete series! THEN they released the first half of this series as an omnibus. In the future they'll release a second omnibus collecting the second half, which you then can buy as a substitute for the missing seventh trade.
So an educated guess for Simone's BOP would be: We'll see four trades (out of five necessary) and then an omnibus ...