Here's a link to the interview where Stevie discusses "two different tours next year" (near the 1:00 mark), which seems to suggest that Stevie is planning a separate solo tour at some point in the near future.
http://www.youtube.com/watch?v=eG-ymkK2ko0
I guess it's possible that all of this has been planned all along, with a quick release of a solo project and quick promotional tour, followed by a larger tour with FM. But with FM rehearsals starting at the end of the summer, it's hard to see how she could pull that off. My bet is that she does a quick tour this summer unrelated to any album before heading into rehearsals, and holds her solo album for next year.