Macbook Pro only came out in feb. I'd be surprised if theres a new Macbook pro before the endof the year. MacPro however is a year old, so i can see that getting refreshed this summer.
If the rumours turn out to be correct then it's MacBook and Mac Mini first pre-installed with Lion followed by Mac Pro and Mac Air in August.
I just hope the rumours are correct then I can get rid of the mirror err sorry iMac and get myself a nice more powerful Mini which I can use with my Matte screen.