Well basically Brandon Sanderson IS wrapping up WoT. There was so much material left by RJ, that they decided it needed three books to finish and Sanderson is finishing it under contract as arranged by RJ's wife Harriet. Two of the final books are already out, with the third due next Spring. Brandon is a very reliable writer, in that he tends to deliver what he promises, or at least he gives his fans plenty notice and good reasoning if he can't deliver (i.e. the final book was originally scheduled for November this year, but has been put back till next Spring). I'm very confident the book will be delivered on schedule, and I wouldn't hesitate to tell anyone who was considering starting WoT to go ahead, because it's as good as wrapped up.
On a side note, I'm a bit WoT fan, but I've never heard 30 books before. I think that might just be an internet rumour.