The Amazon listing for Homestuck Book 4: Act 5 Act 1 has updated with a new short description:

“Twelve trolls start playing a game. Their extensive and convoluted journey will involve extreme role playing, dreadful cinema, emotional theatrics and romantic intrigue, dou8blecrossings and backsta88ery, payback scenarios, mIrAcLeS, a levitating ghostly amphibian, and the troll disease called friendship.”