Add mention of eventual parallelizing superpowers

Author: MadcapJake

doc/Language/operators.pod

@@ -1951,6 +1951,11 @@ previous method call.  With feed operators, that restriction is gone.
 The resulting code could also be seen to be more readable than a series of
 method calls broken over multiple lines.
 
+Note: In the future, this operator will see some change as it gains the
+ability to run list operations in parallel. It will enforce that the
+B<left> operand is enclosable as a closure (that can be cloned and run in
+a subthread).
+
 =head2 infix C«<==»
 
 This X<leftward feed> operator takes the result from the right and passes
@@ -1996,6 +2001,11 @@ to "break into" the statement and capture an intermediary result which
 can be extremely useful for debugging or to take that result and create
 another variation on the final result.
 
+Note: In the future, this operator will see some change as it gains the
+ability to run list operations in parallel. It will enforce that the
+B<right> operand is enclosable as a closure (that can be cloned and run in
+a subthread).
+
 =end pod
 
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