Confirmed: Ralf contracted to Toyota for 3 years.

Not that it's unexpected or anything (http://www.pitpass.com/fes_php/pitpass_news_item.php?fes_art_id=21602), only the duration of the contract is somewhat surprising.

It would be good for Toyota if ralf did what micheal did for ferrari
and make the team perform to his expectations. Toyota would be
very good in f1.

I doubt he will make them as dominate as Ferrari; especially if you compare him to his brother. I do believe he could improve them greatly, espeicallly with all the support toyota is putting behind F1 right now.