It's certainly on our radar. I can't tell you when that will be released though. It depends on a number of factors. What we don't want is to force developers to have to add extra code into their projects to get hot reloading working. That's the way a number of systems work today and I think it's unacceptable. Our plan is to build something that understands Aurelia specifically, including it's DI and Component structure. Once we have that in place, we can do some pretty amazing things, and it's the foundation of a number of other plans we have as well.
That said, if you have to wait 3-7 seconds for an app to reload, you've got a configuration problem in your setup. It should take nowhere near that long.