All of these features that they have added are available in the less than $200 Olympus E-PM2. The biggest difference is the 4/3” sensor versus full frame. However, full frame is actually a drawback for astrophotography.
With astrophotography depth of field is always infinite so the “Full frame Equivalence” argument is irrelevant.
What is important is that trying to get a telescope to cover a full frame sensor is VERY expensive. You can get away with very inexpensive 1.5” filters and adapters with m4/3s where as you need the ridiculously expensive 2” filters and adapters for full frame.
A good full frame setup costs about 10x what an m4/3s setup does and gives you about 2-4x benefit in the image quality department.
You can use much smaller and less expensive mounts and telescopes with an m4/3s camera as well. The crop factor actually allows you to use a much faster focal ratio scope and still get the same field of view as a full frame camera reducing exposures times by 1/4.
Started out doing photography at the age of 6 using an uncle's old 1940 kodak brownie box camera. At 15 years of age, I decided to buy my very own 1975 Praktica SLR camera. I now shoot with a Nikon D850. I do unpaid TFP and commercial paid work.