Is there a reason we haven't heard anything about it since the direct? I thought it might have been at the E3 treehouse.
TPC do things on their own terms, not Nintendo's. It's also not uncommon for time to pass between reveal and next information.
Sun & Moon had 2 and a half months
Omega Ruby & Alpha Sapphire had 1 and a half months
X & Y had a massive 4 months
Black 2 & White 2 had 1 and a half months
Black & White had 1 month