A6 is the future.
A5 is more or less dead. There will be a version coming for A6 owners, but I doubt A5-only owners will get it as well.

To get all the nice new stuff, go and use A6.
I'm only stuck at A5 because of money issues (I have A5 pro, and it has features which A6 <lower than pro> does not have). Apart from that my current project can be finished with A5.

But I'm watching the development of A6, and looking forward for Lite-C.