What does the new OS cycle mean for 32-bit devices?

Ok, I'm still not quite understanding what happens to older devices like my iPad 4 come Sept. (?)

I understand that iOS 11 won't run on it, and I'm perfectly fine with that, no biggie. I was running a JBed iOS 8 for a few years until recently, now it's up-to-date at the moment.

What I don't understand exactly is what is happening to apps at this point.

1) Will I be able to find 32-bit apps on the store any more? Does this mean no new apps for my ipad 4 FOREVER? Will I be able to find old 32-bit apps that I don't own?

2) Will current apps that I own and have installed stop getting updated? This question just occurred to me because I just bought a new app for the first time in ages and just thought "wait, am I only going to get 1-2 months of updates out of this?"

If there's any articles that answer these, feel free to throw in the link if you have it handy, thanks.