The HS: Triumphant Prereleases are here at last! It looks like an OK set, in spite of it not having Lost World like everyone expected; no biggie to me, since a) Gengar Prime is still pretty dangerous without it (especially with Gengar Lv. X), and b) it just gives us something to look forward to in the next set!
The HS: Triumphant Prerelease promo is apparently Electivire, and the sleeves feature Celebi.
If you don't mind spoilers, most of the card scans can be found on Pokebeach.