The Nissin Air Di700a, a radio-based wireless TTL system which I wrote about here, is apparently now available for Sony cameras. According to another ebay listing, it uses the new Multi-Interface Shoe.(used in the a6000, a7 series, etc.), not the Minolta hotshoe.
The seller describes it as a "pre-sale" (pre-order) although the seller's specified release date has already passed, so it appears to be readily available. You should probably contact the seller to confirm. Also please note the price of this combination is significantly higher than the price of a similar kit for Nikon or Canon, which is around $300. Hopefully, it becomes available at a lower price for Sony as well.