I dont understand i thought he was back, he was on one smackdown and after that hasnt been on since  

Actually he has been on Smackdown!, it just hasn't made to air. For the past few weeks if you went to see Smackdown live you'd see The Undertaker come out and do something (2 or 3 weeks ago, he took out Bradshaw). But because of the time it hasn't made it to TV. Which is kind of funny because when he has been coming out he has gotten more cheers than anyone else, even John Cena (who is now the most popular superstar in the WWE) on some nights.

Some people think he'll show up at Backlash and cost Kane his match vs Edge, and thus Taker would be on Raw, but there still are rumours of him feuding with Booker T for Judgement Day in May.