Rough sketch of 3.251 release notes

NEWS

@@ -1,3 +1,51 @@
+3.251 (2025-??-??)
+==================
+
+User-visible changes in this release:
+
+ * 4-cell mosaic graphics at Unicode 16 codepoints
+ * ZVBI compat mappings fixed
+ * Compat aliases marked in complement
+ * Newly-supported characters:
+   - U+0122
+   - U+0123
+   - U+0136
+   - U+0137
+   - U+013B
+   - U+013C
+   - U+0145
+   - U+0146
+   - U+0156
+   - U+0157
+   - U+0180
+   - U+0182
+   - U+0183
+   - U+0218
+   - U+0219
+   - U+021A
+   - U+021B
+   - U+0228
+   - U+0229
+   - U+0243
+   - U+23E8
+   - U+2661
+   - U+2662
+   - U+2664
+   - U+2667
+ * Redesigned characters:
+   - U+0294
+   - U+0295
+   - U+0296
+   - U+02A1
+   - U+02A2
+   - U+1E28
+   - U+1E29
+ * New 'cvXX' features and hence variant forms of many glyphs (list?)
+ * New small-cap version of U+A780
+ * New 'ss05' feature
+ * New names for *.saa* glyphs?
+ * New shape for SAA5054 ugrave
+
 3.246 (2024-11-24)
 ==================