If you pay for your 3rd month, you'll get Legacy. The cut off for paying is 2.0 beta, which isn't for a few months still.

The announcement and the removal of the 90 day option is happening because 2.0 beta is roughly 90 days away or less. I think they would like to exclude people who join next month or later. They will not be able to get Legacy because they can't just pay up-front for 90 days. I think this is reasonable.