This new DMF is intended to replace the (not so) undocumented DBCC LOGINFO command. I say undocumented as I’ve seen tonnes of blog posts about it but never an official Microsoft page.
This is great imho, we should all be analyzing our database’s transaction log and this will help us to just that. Now there are other undocumented functions that allow us to review the log (fn_dblog and fn_dump_dblog, be careful with the last one).
I’m glad to see this make the cut, as replacing informative / idempotent DBCC commands with DMVs makes it easier to query this data, particularly in conjunction with other DMVs or system tables.