See here: https://www.bhphotovideo.com/explor...m_content=Retail&utm_term=sony-a99-full-frame or here: http://www.popphoto.com/new-gear-sony-announces-a99ii-at-photokina-0
I shall for the time being, but your A850 (and my two) have just gone up in value, as the A-mount DSLR is no longer obsolescent. Likewise with the lenses.
Don't bet on it! At least the lenses can be used on the likes of the Sony CSCs with the appropriate adaptor, I have a couple of Zeiss primes, my main original reason for buying the A850, aside of that I find it to be rather a nice camera.