It showed up briefly on the website when I first posted this -- it still says "special offer" next to BA on the membership rewards page. It seems like they haven't yet fixed the page to properly reflect the promotion but it definitely is in effect.
FlyerTalk Evangelist, Moderator: American Express, Citi, Diners Club, Signatures
Join Date: Jun 2003
Location: Miami & London
Programs: AA 2MM Perpetual Platinum; VS, HH & SPG Gold
I can now see the offer on USA Membership Rewards First website. It does not appear on the standard Membership Rewards site. The bonus could be limited to First (Platinum and Centurion) cardholders, but it may just be a website problem because it simply says:
I have checked our Membership Rewards database to verify the specifications of the promotion that you were referring to and have had no luck in finding the details to that promotion. The only promotion that we have had recently was for Ameriprise Consumer Cardmembers, when solicited could receive a 20% bonus when transferring Membership Rewards points to British Airways Priority Club. This applies to all Membership Rewards points transferred to a memberís Priority Club during 04/01/10 through 06/30/10. Bonus points will be reflected in the total amount of the point transfer transaction from Membership Rewards. Minimum transfer of 1,000 Membership Rewards points into BA Miles.
Solicited Cardmembers can redeem offer by clicking on "TRANSFER POINTS NOW" link in the email.
Once you have transferred Membership Rewards points, they become subject to the Terms and Conditions of the partner program and cannot be transferred back to your Membership Rewards program account. Taxes, fees, charges and surcharges, including airline surcharges,may apply on British Airways redemption flights and upgrades.