The answer is yes, we have done work to support long paths in Windows. As Windows unblocks MAX_PATH scenarios you'll be able to take advantage with your .NET 4.6.2 applications. I plan to talk about what we've done with paths in both .NET Core and .NET 4.6.2 on an upcoming On .NET talk on June 23rd. Stay tuned to the .NET Blog for details.
In the meantime you can read my prior posts on path handling to give yourself some useful context for what I'll be discussing.