Unity game engine now free for indie Android and iOS developers, BB10 and WP coming soon3
Previously, the game engine had cost upwards of $800 for mobile developers, even though the company had made the desktop tools free to use back in 2009. Of course, this only applies to smaller developers. Companies that have "a turnover in excess of $100,000 in their previous fiscal year are required to use our paid version."
And, for those developers who had purchased the Android or iOS add-ons in the past 30 days, the company will be in contact to offer "discounts on future purchases". So unfortunately, no one is getting a refund.