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Sounds awesome if you can get a trip planner working in JSIt was really a horrible hack that took into account only lines and stops (no trip times, transfer times, schedule, etc.) but as a simple visual app, and in the context of a hackathon, it worked.
It was even featured as "Google Map of the week" on the Google Geo blog before it was even showed to RATP
http://googlegeodevelopers.blogspot.fr/2013/08/interactive-m...
But now we need to "muscle up" the routing part and so are leaving JS completely (however if the data can be reduced significantly it would be interesting to go back to it someday).
OTP is much too big to ever migrate on a mobile device; will definitely check out rrrr; what do you use yourself?