Just received the email with offer 20min ago. My offer was:
"Book and you’ll earn 3,000 bonus Starpoints on your third stay, 3,000 on your sixth stay and 3,000 on your ninth stay — up to a maximum of 9,000 Starpoints."
Currently I am:
24 stays YTD
41 nights YTD
If i'm reading the T&C's correctly, it appears that all my stays since April 1st count.... (super awesome if that's true!)