If you're interested in checking it out, we'd advise doing it soon: The $5 tag for Episode 1 is a promotional one. There's no word what the regular asking price will be, but the full two-episode Steam version is currently going for $25/£19.
After raising more than double its $400,000 funding goal, developer Revolution brought the new entry in the long-running point-and-click series to Steam and Vita in 2013. The final episode is coming as a free update on those platforms, and it's due in Q1 2014 i.e. soon.
As for the question of a release date for Android; we think the answer has something do with this goat that keeps butting us, but otherwise we're stuck. We'll keep you informed.