The Hearthstone beta is going to be ending soon. This means that if you want to get a Golden Geblin Mekkatorque card, you're going to need to get it now. You'll be able to craft the non-gold version of Mekkatorque after the beta has officially ended -- so no need to worry about not having the card in your toolbox (which, personally, I don't find very useful).
When posting about the end of the beta Community Manager Zeriyah didn't provide an exact end date, however these announcement usually come out two to four weeks before something happens. That's just based on my own historical understanding of the way Blizzard operates, so take it with a grain of salt. Furthermore, there isn't any details on the release of an iPad or Android version.
Zeriyah's full post after the break.