Just received this from BDDC:

Dear SpurMan

We'd like to advise you of some forthcoming changes to the bmi Diamond Club programme.

From 19 April 2012, the ability for Diamond Club members to earn Status and Destinations miles and to redeem miles will cease on the Lufthansa Group airlines (Lufthansa, Swiss, Austrian Airlines, and Brussels Airlines).

Any redemption tickets issued prior to this date for travel will be honoured.

All Star Alliance status benefits will remain unaffected by this change.

We are working with British Airways to offer Diamond Club customers the ability to earn and redeem miles on British Airways and its oneworld partners following completion of the sale. We will do everything we can to communicate more detail as soon as possible.

Regards

Keeley Downing signature
Keeley Downing
Diamond Club Manager

Looks like BDDC will end up being merged into BAEC. Be interesting to see the earning rates for BDDC on BA, as they will probably give a good indication of the likely switch rate. If it's 1:1 I'd be surprised but very happy!