Upgrade CS3 -> CS4 question

Within the last two months, I upgraded to flash CS3, unaware that CS4 would be coming out so soon. Now that I found out that CS4 is out, I remembered some sort of offering from Adobe whereby you could upgrade for free if you had recently upgraded your version of flash.

Unfortunately, I can’t find any specifics on this anywhere, and I’m wondering if it’s still practiced. I’m really hoping I didn’t just trick myself into believing this is real, because CS4 looks pretty darn good, but I’m not ready to upgrade again so soon.