HA product cycle? Predictable new product announment dates?

In every industry there is usually a predictable timeline of sorts with regards to when new products are introduced, etc. for instance, I know with near certainty that in or around next June we will have an iPhone announcement and by September we’ll have it arriving in stores for purchase. Is it the same with hearing aids? If so what are the general product cycle dates? Do they fall around a particular conference? Is it the same for the major manufacturers or is it different for eah brand throughout the year?

I ask because I’m likely to have my aids for a while so I want to make sure I’m not purchasing just prior to any major upgrades or announcements.

New products are usually announced at the AAA show in the US.