The Supreme Court came out with their full opinion today. Basically, they agreed with the Governor becasue they agreed it caused "direct injury" to her by withholding the bill until the last second (actually, after the last second if we're getting technical here). This is all kind of a moot point but actually may still come to help the governor next year when I'm sure we'll be in this same situation on June 30th.
I read through part of it and although the State Constitution doesn't set a time line, it does say "when finally passed". The court agreed that when means now, not when you feel like it.
Comments from the Governor Here.