According to the TV Wakayama's broadcast schedule
, the new episode of The Melancholy of Haruhi Suzumiya
is going to air on May 24. The 8th episode of an ongoing rerun of the series is listed as "Sasa no Ha Rhapsody" ("Bamboo Leaf Rhapsody"), which is a title of a story that has not been adapted yet.
Update on May 18th, 10:00 am JST
The subtitle of the episode was erased from TV Wakayama's website. The 8th episode in question will be aired on SUN TV on May 21st, at 24:40 am JST.
According to GIGAZINE, TV Wakayama staff said they were not supposed to disclose the subtitle of Haruhi episode. They refused to tell GIGAZINE if the new episode is scheduled to be aired on the day.
Update on May 21th
The new episode indeed has aired.