Insider news says that Resound is working directly with Google on developing Android streaming capabilities (Resound partnered with Apple to do this before the low power bluetooth chip was released). The news I have read also mentioned that Resound will be the first hearing aid company to have a product that allows streaming from an Android device. This hints at an arrangement between Resound and Google, which is certainly not surprising.
The real answer to your question, though, is unknown. I have not seen a release date or even a confirmation that direct audio streaming will be in the next major Android release, even though that seems to be the general assumption at this point. When that will be is unkown. Android 9.0 (codenamed "Pie") is in release right now, so the next major release will likely be a ways in the future.
Since Android doesn't have a uniform operating system, and each brand of phone has its own capabilities, streaming to all Android phones is nearly impossible. Unitron has a very limited stream to all Androids, but only one ear and only phone calls. Due to the very limited ability of stanard Bluetooth, it can only go to one device so therefore one aid.
Hearing Aid Manufacturers are working with a select few Android Phone Manufacturers to resolve the issues of direct to phone streaming. So eventually there will be some, but only limited to certain models and brands. My feeling is that it will happen in the next couple of years.
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