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Let's face it.  Bp. Fellay should not have been the superior general of the Society anyway.  That's not even taking into account his length of tenure.  ABL never intended that a bishop should be elected SG.  But somehow he got in.
I see the leadership ranks of the Society filled with priests, (mostly European), who can not bear the sight of Bp. Williamson.  I think they have had problems with His Eminence for years, long before he was expelled.  The second in command, the German Fr. Phluger, is, IMO, a scarcely disguised liberal.   I think he, in particular dislikes H.E. (Read his 8 page letter to the bishop)
But Williamson's real problems came at the time he gave the interview in 2009 to a Swedish TV network.  He had been saying similar things about the "h0Ɩ0cαųst"  for years prior to his remarks in the last 5 minutes of an hour long interview.  Everyone knew, including most, if not all of the bishop's confreres, not to mention seminarians and the lay faithful throughout the world, his views on the h0Ɩ0cαųst, the "gas chambers," the "six million, etc,"  Williamson was not particularly shy about expressing them.  And yet, the SG said that he had never been aware about how H.E. felt on these matters .  What a crock of lying  ______!  
Pope Benedict, at the time, pretended likewise that he hadn't been aware of +Williamson's views on the subject.  Pure baloney!  It's just that the lifting of the excommunications came at about the time the interview was conducted, late November, 2008,early January of 2009.  The affair was fresh in the minds of everyone, and a total embarrassment to Fellay & Co., not to mention the pope.  Personally, I loved every entertaining minute of it.
But to answer the question:  No, Bp. Williamson will not reunite with the Society, not until +Fellay & Co. are out of there, and certainly not until all the Tribal connections are severed.  The SSPX can not survive to continue its original mission until its Augean stables are cleansed.

Moorslayer, as a "recent convert", your curiosity is to be commended, however, before you plunge in to ask detailed questions, wisdom would have that you first prepare yourself to know the truth when it is presented to you.  

I encourage you to take as much time as need to firstly understand the crisis in the Church.  Read as much as you can about Vatican II, the errors of it, and the reasons for the errors. Archbishop Lefebvre himself wrote many books about Vatican II and his own response to the errors promoted by it.  Read, read, read, there is no quick way to get where you need to be.  

With regard to the most current events, say post 2012, this forum site has links devoted to provide that information too.  Look at the 1st 4 forum lines under SSPX Resistance on this forum. They provide a lot of historical information.

Check out truetrad.com also.  Other sites are available for your review.  

Finally, asking innocuous questions whether Bishop Williamson will return to the SSPX serves no purpose, as such speculation is not worth the time taken to read the sentence.  Only the SSPX and the person you mention knows the answer to that question, so I encourage you to not use forums  to encourage speculation.  

Nickolas:

Finally, asking innocuous questions whether Bishop Williamson will return to the SSPX serves no purpose, as such speculation is not worth the time taken to read the sentence.  Only the SSPX and the person you mention knows the answer to that question, so I encourage you to not use forums  to encourage speculation.

Come again!?  this forum and others like it are full of "speculation" on a wide range of issues.  Why can't Moorslayer inquire into these sspx matters?  I don't get it.  It is at least "worth the time taken to read the sentence," IMO.  Without lots of "speculation," or if speculation were discouraged or not permitted on many topics, Cathinfo would probably shut down, wouldn't it?