Please apologize my bad english, but as a Borussia Dortmund-Fan, i wanted to tell you that the Deal is locked.
Pienaar will be lend to Everton until the end of the season. I don't know if Everton has a option to buy him after the season (but i guess so).
My source is westline, the closest source belonging to Borussia Dortmund. And yes, i understand if no one believes me, but i can tell you, there are no more doubts.
In Germany, Pienaar was signed to be the replacement of Tomas Rosicky in the offensive midfield.
A fatal error by the the club. No goals and only one assist. If Everton has a place for him on the right wing, you COULD have fun with him.
So, don't make the same mistakes.
UPDATE: Borussia Dortmund revealed the deal on the club-page: http://www.bvb.de/?%9F%2Ak%97%84%ECSl%E6%84%9B