According to Hussie’s latest news post the gigapause will likely end in the middle of, or the end of next month.
HOWEVER, Homestuck is not finished, nor will Hussie post all the new pages. Rather he plans to stagger the release of pages he has created in order while he continues to work on new pages. In other words, there will be no gigaupd8.
At this point it is uncertain whether Hussie will run out of pre-created pages before he finishes Homestuck or not.