According to some on the I&O 4050 and 4054 are eventually supposed to head to NSB for work. Whether or not they would return to the I&O is unknown. There's a lot of unkowns with Railamerica and it's future due to Fortress' financial situation.
As for the CF&E, it's really part of the I&O. There's seperate management, union contracts and marketing contracts, but everything is controlled out of Cincinnati and the I&O offices for the most part as a single line operation. That's why the power is shared and the I&O maintains the CF&E fleet. CF&E 3881 and 3885 are the only units not currently working on the CF&E-I&O system.
I almost asked if the other two would join... One would assume that they could use some TLC after their time on the Indiana & Ohio. I wonder if traffic is down on IORY or if these units would be replaced by FEC GP or SD40-2's. Some of I&O's bigger power has been running around on the CF&E lately (but probably because most of their GP38-2's have wound up on other roads).