The Camranger solution would be great, and if they come out with a solution that would be great. The proprietary port Sony uses, however may slow them down. Sony's microUSB port is different than the "standard" that most other companies use.
I am not that family with the layout of the A7 family but on the Nex 7 the IR sensor was on the front of the camera, which limited the use of the remote, and it was very point to point. If the A7 has a IR sensor on the back of the camera the IR release may be more useful. However there is still no intervalometer soluiton for the A7 family I am aware of. Camranger should fix that. The Sony timelaspe app only works with the fixed shutter speeds and will not work with bulb.
Paul