Confused about Macbook Pro and Leopard?

I am planning to buy an Apple Macbook Pro and was close to getting one until i came across this forum where they were talking about how people should just wait till the Leopard comes out around October this year or next year around July.

I'm a little confuse, is Leopard like a program they are planning to add in the Macbook Pro or what?

Please someone help me

Thanks