I don't think so: the book is not that hard to translate into English. The vocabulary is not that of a Shakespeare's one (meaning you don't have tons of very idiomatic words and expressions). I'm not saying Guarné didn't write the book in basic French, but to me it shouldn't be that hard to be translated.
I'd probably think about a translation available for the second semester of 2015, provided Pix considers it worth the investment (but I guess they will, as they probably sent a good amount of them to foreign countries, even with the language barrier).
The only issues would be that:
a) Pix has a lot of other projects they want to focus on right now.
b) The book still has a lot of content for them to translate, so even if they already found a translator, it will be take a few months before they would give an official announcement about the official release of the English version.