Just a quick word about the Sony multi-interface hotshoe. There are several problems that have arise with this design over the last couple of years and I just wanted to address them really quick just to make everyone aware. Hopefully you have seen my hotshoe fixes on youtube but here are the other issues.
The first problem is the fact that Sony is now coming out with cameras that they are claiming to be weather sealed now with the multi-interface hotshoe and it is not technically weather sealed. If water gets into the edges of the hot shoe along the front edge it will have a tendency to short out the entire camera system or at least the monitor depends upon what pin it actually contacts. To overcome this issue is very simple put tape over your hot shoe.
Now the second issue that we are all aware of is actual lighting systems for the Sony multi antes hotshoe. There are several issues with this. First off Sony flashes are just awful. Their big bulky have a tendency to overheat. Then you have Metz flashes which are not much better. But then you have the Phottix Odin and Mitros system, they're completely out of stock on the Sony product and they don't any plans to make any more. Last but not least you have Nissin air1 commander system wtih the DI700a and this is probably your best bet for the Sony setup. This is currently the only true wireless setup for HSS and TTL. The i40 is the best portable flash you could possibly put on their cameras. There is still no true wireless studio trigger system for HSS and TTL either but as long as you're aware of these limitations and the limitations of the shutter speeds then you'll be fine but this is an issue and it's an expensive issue there's no way of getting around this cheaply.
Third issue about the AF assist beam not working on flashes. DPreview confirmed with Nissin that this is due to Sony E-mount cameras failing to send a signal over the hot-shoe connection when the shutter button is half-depressed.
A few things that have worked but are no longer easy to find. Pixel King wireless triggers for the old Minolta shot shoe mount seem to deliver high speed sync with adapter. I haven't tried it but lots have mentioned that this solution works.
Nissin is planning on expanding the Air 1 Commander to work their new triggers and flash, the Air R and I60 flash. Hopefully we will see something from them soon. I will post a link as soon as they come out. Im guessing October for the i60. I hope this means micro four thirds will be getting a Nissin Air too since they will be making the i60 for micro four thirds cameras. Phottix is coming back with the Odin II so keep your fingers crossed.
Here is link to my playlist for Sony flashes and fixes; https://www.youtube.com/playlist?list=PLw_hMQo1n8OKZ5w9aAv6FyAO-Yg2sjsSe