[DOC] Update TDF release notes

README/ReleaseNotes/v610/index.md

@@ -84,8 +84,13 @@ The following interfaces have been removed, after deprecation in v6.08.
 - `TTreeReader::SetLastEntry()` has been deprecated. Its name is misleading; please use `TTreePlayer::SetEntriesRange()` instead.
 - `TTree::Branch()` now complains for wrong leaf list strings, e.g. "value/F[4]" (which should really be spelled as "value[4]/F").
 - Allow reading of older version of TTreePerfStats (ROOT-8520)
-- Introduce TDataFrame which offers a new and highly efficient way to analyse data stored in TTrees
-    - Allow to build a TDataFrame from an empty source by specifying the number of entries to be generated on the fly.
+- Several improvements to TDataFrame: a modern, expressive interface to multithreaded ROOT data analyses
+    - Add support for the creation of events on-the-fly (e.g. via Pythia or user-define generator functors), with no need for an underlying TTree of data file
+    - Add runtime branch type inference to all relevant actions: TDataFrame checks the column types at runtime and just-in-time compiles the corresponding (templated) action
+    - Add `Range` transformation: for non-parallel runs, `Range`s are now available to filter events according to their `start`, `stop` and `stride` parameters
+    - Improve multi-thread speed-up through various optimisations of the parallel event-loop management 
+    - Update the user guide to include the generic `Fill` action and ranges
+    - Bug fixes and improvements to Doxygen docs
 - In `TTree::OptimizeBaskets()` do not call GetBasket(0) to avoid disc reads
 - It is now possible to define the precision of the default histogram created
   by `TTree::Draw`. Three new parameters are available in `$ROOTSYS/etcsystem.rootrc`