Last week a Nintendo Direct was scheduled for Thursday 6th September. However, due to an earthquake in Hokkaido the direct was postponed. We are still yet to receive news from Nintendo for when this direct will air, however new rumors point to it happening this Thursday.
According to Nintendo Life, the postponed Direct will happen exactly one week later at 11:00 pm BST (3:00 pm PT and 6:00 ET) on Thursday 13th September. This is not yet confirmed, however the source has been reliable in the past.
Source: Nintendo Life