As a new Hive user with some limited coding experience, I would love to have such an ('official') API available. From reading various articles from here and elsewhere, it would appear that BG are either not interested in developing user access to their Hive, or, are dragging their feet over this issue.
I agree that BG would be very short sighted to ignore this aspect of their product(s), and would likely lose out to other companies who develop their products with user users in mind.
Although I like the product so far, I would like it much more if there was a route provided to allow me to interact with the Hive via my own coding. I have in mind, a much more comprehensive data presentation that cover much more than the already handy Temperature History bar chart on their site.
It would be nice if there were more Dev input to this thread to keep us abreast of current/likely developments.
I like the idea of a plug in power plug to thermostat with internal rechargable battery - would allow battery free power source whether on the wall or moved to another room.
A 'must have' for future versions in my opinion. (only 3 hours experience - installed today :)