Just received from BMI:
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Dear Xxx

We’d like to advise you that the EU Competition Authority has today approved the sale of bmi to IAG. We are very aware that Diamond Club members want to know what will happen to their accounts when bmi is acquired by British Airways.

The deal between bmi and British Airways is due to be completed around 20 April 2012. We would like to reassure you that we plan to operate our summer schedule as normal and you can continue to earn and redeem Diamond Club miles during this period.

We are working together to announce a Diamond Club partnership with British Airways. This will include the ability to earn and redeem Diamond Club destinations miles across the bmi and BA networks.

We will be communicating regularly with you as more information becomes available and flybmi.com will also be updated with the latest information."

The bit about being able to earn DC destinatinmiles on BA would seem to point to an ultimate 1:1 merging of the schemes to me. But maybe not on status.

Would also seem to herald BMI's immenent demised from *A.