Some of us gambled to get in on the deal and won 90K IB avios, we gambled again with negative balances and lost. I have ~30k negative. I grabbed a random one way business class just in time yesterday though could not find outbound space (yes i'm a dummy i didn't just grab economy) Of course now that they are gone i get offer to upgrade to premium economy on a return flight MAD-BOS i had booked long before the promo. too bad that didn't come earlier.
Those who did not book right away were pretty out of luck as it seemed the purposely blocked redemption on the best carriers. There were some good dates in CX F JFK-YVR but even though BA showed available they stopped appearing on IB site. I'm just going to sit on the negative balance for now and see how it plays out. Worst case i move them back from BA where they have been sitting since day 1.