check pm please sorry by mistake clicked on no...Well u'll recieve a mail in 2-3mins after the invi is sent and after that just relogin. And u'll see "Try New Orkut" in top tab click tat or u can also click the new orkut logo which 'll appear beside ur name in home page.......!!
Nytime u can revert back to old version and vice-versa. New orkut 'll remail unaffected....!! U wont loose it.....!!