Prepare NEWS for the next release

Add a placeholder for the next release to the NEWS file and start the list
of fixed bugs with Bug 444495.

NEWS

@@ -1,3 +1,53 @@
+Release 3.??.? (?? 202?)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This release supports X86/Linux, AMD64/Linux, ARM32/Linux, ARM64/Linux,
+PPC32/Linux, PPC64BE/Linux, PPC64LE/Linux, S390X/Linux, MIPS32/Linux,
+MIPS64/Linux, ARM/Android, ARM64/Android, MIPS32/Android, X86/Android,
+X86/Solaris, AMD64/Solaris, AMD64/MacOSX 10.12, X86/FreeBSD and
+AMD64/FreeBSD.  There is also preliminary support for X86/macOS 10.13,
+AMD64/macOS 10.13 and nanoMIPS/Linux.
+
+* ==================== CORE CHANGES ===================
+
+* ================== PLATFORM CHANGES =================
+
+* arm64:
+
+* s390:
+
+* ppc64:
+
+* ==================== TOOL CHANGES ===================
+
+* DHAT:
+
+* Cachegrind:
+
+* Callgrind:
+
+* Massif:
+
+* Memcheck:
+
+* =================== OTHER CHANGES ==================
+
+* ==================== FIXED BUGS ====================
+
+The following bugs have been fixed or resolved.  Note that "n-i-bz"
+stands for "not in bugzilla" -- that is, a bug that was reported to us
+but never got a bugzilla entry.  We encourage you to file bugs in
+bugzilla (https://bugs.kde.org/enter_bug.cgi?product=valgrind) rather
+than mailing the developers (or mailing lists) directly -- bugs that
+are not entered into bugzilla tend to get forgotten about or ignored.
+
+444495  dhat/tests/copy fails on s390x
+
+To see details of a given bug, visit
+  https://bugs.kde.org/show_bug.cgi?id=XXXXXX
+where XXXXXX is the bug number as listed below.
+
+
 
 Release 3.18.0 (15 Oct 2021)
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~