In the old days of the Lumia 1020 and PureView 808, Nokia was known for using Carl Zeiss lenses and PureView imaging technology; however, a lot has changed since then. Microsoft purchased Nokia's devices and services division, and what's left of the company is only now getting back into the smartphone market.
In fact, the Nokia phones being released now are actually made by HMD Global, with the brand licensed to it. With that in mind, it shouldn't be a surprise that the company isn't quite sticking to the same kinds of products that the old Nokia made, as it confirmed on Twitter that it is no longer using the Zeiss lenses (via VTECH):
The other question that was asked was about PureView, and while many fans want a refreshed device that uses the 41MP lens found on the Lumia 1020, it's important to note that the PureView imaging technology is owned by Microsoft at this point.
Of course, this doesn't mean that Nokia-branded phones won't have great cameras going forward; they just won't work the same way that they used to. Nokia Mobile has confirmed that it will continue to invest in imaging technology, just as any smartphone company would.