New Apple TV is definitely coming out, but the timing is unclear. Some sources think it is due any minute now, as soon as next week. But some sources think the release is pushed to iOS and tvOS 14 in the late fall.
Whenever that is, reliable sources point to new Apple TV having (1) faster processor (most likely A12X) for improved frame rate on games, (2) double the storage, and (3) redesigned remote control (maybe minor, maybe major, no one outside Apple knows).
Hopefully, there will be few additional improvements and features.