when will the new French Tree
be out for everyone?
You can try on several other (new) account until one falls into the A/B test, if you really want to have it (makes sense to start with the new one).
But maybe you should first complete your Spanish tree and build a "language core" so you don't get too much confused as both are in the same language group: http://how-to-learn-any-language.com/e/languages/similarities/spanish/index.html
BTW: I am not "actively" learning Spanish, only did on Lingvist (1000 words in 11 days); I just "played around" a little bit with the "DuoLingo Android app placement test" to find some similarities with my Portuguese.