Will I have to pay for the OS Lion Update?

So I just recently purchased a 13" Macbook Pro, it arrived yesterday, 5/6. I will be away and won't be able to open and start it up until June 1st.

WWDC is only a few days after I will have had the computer. I'm not very familiar with it, but I assume I register the MBP to my Apple account on startup?

Will I still have to pay for the OS Lion Update, if/when they announce the OS less then a week later?

I could see them, Apple, having a grace period for this kind of thing and just want some opinions...

Thanks!