Decimation X4 is on hold.
Decimation X4 evolved from the extended development of Decimation X3.5. Decimation X4 was developed into a release prototype, but release efforts were dropped in favour of porting Score Rush to Xbox One and PS4, which became Score Rush Extended (PS4).
No details of the Decimation X4 project have been released. The last release of our Decimation X series was Decimation X3. Please see it for now.