Couldn't find any posts about Maluuba in the forum, but watching the TechCrunch interview with Maluuba at CES, they've mentioned they are expecting to launch the application on WP (assuming WP8) before the end of the month.

You can read about them and watch the interview here, Talking To Your TV, Your Car, Maybe Your Fridge? Maluuba Is Connecting Users To Their Favorite Devices By Voice | TechCrunch

Mentions the WP application at the 1:58 mark of the video.