Log Message:
Changes 52.1:
Unicode 6.3: New bidi control codes, new Bidi_Class property values, two new \ 
bidi "bracket" properties; for other property value changes see the \ 
UAX 44 summary.
The bidi algorithm implementation has also been updated to support the new \ 
properties and to match the updated algorithm in the Unicode 6.3 version of UAX \ 
9.
Note: ICU 52 still uses collation root data based on Unicode Collation Algorithm \ 
6.2 (UCA 6.2). (However, ICU 52 does use CLDR 24 collation tailoring data.)
CLDR 24: Improved coverage for top 70+ languages, fractional plural rules and \ 
forms, many new measurement units, major simplification of collation rule \ 
syntax, preliminary version of European Ordering Rules, new relative fields such \ 
as “last Sunday” and “now”, and much more.
Time zone data: 2013g.
Support new variants of Islamic calendar:
"islamic-umalqura": Umm al-Qura.
"islamic-tbla": Tabular (fixed intercalary years), with astronomical epoch.
Made Calendar getDayOfWeekType behave as documented.
New API for converting between Windows time zone ID and IANA tz database ID.
Technology Preview: New API for more granular control of DateFormat parse leniency.
DateTimePatternGenerator:
Support recently-added time zone pattern characters O, X, x and updated support \ 
for V, Z.
Support newly-defined skeleton character ‘J’ to generate preferred \ 
hour cycle without any day period indicator (such as AM/PM for h).
Implement support for plurals that depend on displayed fractional values.
MessageFormat and currency formatting etc. select appropriate plural forms for \ 
values with decimal digits (after the decimal point).
Segmentation:
Add dictionary-based word & line break for Lao.