Developer Parallel 42 has announced the end of line for their 777 Immersion V1 product for prepar3d v4. Initially released in 2014, this product improves the PMDG 777 with a variety of special effects. It will still be available but no further development will take place.
In its place a new V2 is coming which will support the PMDG 777 in prepar3d v5, which includes a new -200ER variant.