Will there be Esperanto for German or
Will there be Esperanto for German or French speakers after Esperanto for Spanish is complete?
I feel like I read at some point that Portuguese was planned to be next after Spanish. Although that would've been quite awhile ago, and amuzulo lives in Germany, so German would seem a plausible next choice. I suspect we'll see EO for ES, then Tree 2.0 for EN, and a few months after that something about a third language.
Given the the enthusiasm of Esperanto speakers and the current dynamics, with half a million users of Esperanto for English, these courses will no doubt arrive sooner or later. The number of learners is somewhere between Welsh and Polish, which seems quite reasonable to me.
I think Esperanto for decidedly non-European languages such as Arabic and Chinese would be particularly important, though. For speakers of those languages it's generally a good idea to start with something very easy such as Esperanto or Interlingua to get fast results and a general feeling for European languages, and to move on to a specific language such as English after that. The advantage of Esperanto in this context is of course that you can find speakers everywhere, and the advantage of Interlingua is that you can easily communicate with the much larger number of Spanish and Italian speakers.