I'm not a Bionic owner but I want to share some good news:
Found ICS leak on cheesecake. 6.7.2231 - DROID BIONIC - droidHIVE Forums
And it was reported to be rootable using the ICS root method, I assume that's the same method floating around the Droid4 forum. Don't ask me how to install it, I have no clue. After seeing all the disappointed Bionic owners chime in whenever a new ICS leak appears for the D4 and Razr, it's nice to see the Bionic get some love from Moto.