According to the most recent edition of Wrestling Observer Radio, while TNA did in fact tape an episode of Impact to air on 5/22, Destination America does not want a new episode of the show to air on the Memorial Day weekend, so Destination America will instead be airing TNA Slammiversary 2014.
TNA reportedly knew ahead of time that viewership for 5/22 might be lighter than usual, so they taped the show with very little story line advancement. The episode will air internationally on 5/22, however.