They have consistently stated they are purposefully releasing Homestuck in small chunks over two months, to give them time to work on later acts, and to re-create the original feeling of daily updates. The other MSPA's will likely be added once the devs have time to shift focus, kohi is very vocal on discord about development of the site they were not rushed to push it out today compared to any other day- the site has actively been down to everyone's dismay for MONTHS if theres any pressure IMO its from the fans who have been fiending (understandably so) for an official way to read homestuck ever since it went down.