Of course I cannot reveal my sources for any of this discussion as to the frontrunners for the position of Superior General of the SSPX, so take this with a "grain of salt."
With regard to the leading candidates being mentioned with only 2 1/2 weeks until the General Chapter on July 11th, here is the information I have heard about the situation: Leading Candidates:
1st: Fr. David Pagliarani: Has been the leading candidate for at least 6 months. Is favored by the more "conservative" of the SSPX priests. Was District Superior of Italy and is now Superior of the SSPX seminary in La Reja, Argentina. I will post an interview with Fr. Pagliarani below.
2nd: Fr. Jurgen Wegner: Former District Superior of Canada and current District Superior of the United States. I have not heard his name mentioned for this position in the past, his name has just emerged strongly recently. I would say he is the dark horse moving quickly up to the front.
3rd: Fr. Yves le Roux: Priest who replaced Bishop Williamson in the American Seminary in 2003. Has molded the whole life of the seminary for the past 15 years. Is considered a possible compromise candidate and a "centrist."
4th: Fr. Niklaus Pfluger: 1st Assistant and the one in charge of transfers for a number of years now. Has been called "the power behind the throne." Recently, he said publicly that come July he "would not be in a leadership position in the SSPX." Treat that statement as you will.
5th: Bishop Bernard Fellay: Superior General for an entire generation. Has stated that he does not want to be considered again for the position of Superior General. His re-re-elction is not likely, but who knows.
I post below the 3 parts of an interview in 2011 with Fr. David Pagliarani, the frontrunner. This interview comes from the SSPX's website, sspx.org: Interview with Fr. Davide Pagliarani: (see link above for interview)