You probably won't learn anything from this post. Gonna try to prefix titles of such posts with "LIST" from now on :-) This post is just a list of kbs I am especially interested in.
Build 12.00.4427, SQL Server 2014 SP1 CU3 became available October 21, 2015.
Cumulative Update 3 for SQL Server 2014 Service Pack 1
These are the fixes that I have a particular interest in.
FIX: High CPU usage after you reduce the value of the CAP_CPU_PERCENT argument in creating a resource pool
FIX: Scheduler deadlock on primary replica when you remove a replica from an AlwaysOn availability group in SQL Server 2012 or SQL Server 2014
FIX: Queries take longer time to compile in SQL Server 2014 than in earlier versions
FIX: DBCC CHECKFILEGROUP reports false inconsistency errors on database that has partitioned table in SQL Server 2014
FIX: Sort operator spills to tempdb in SQL Server 2012 or SQL Server 2014 when estimated number of rows and row size are correct
Trace flag 7470
FIX: Rare index corruption when you build a columnstore index with parallelism on a partitioned table in SQL Server 2014
FIX: Access violation occurs when you execute a query that contains many joins and coalesce functions in SQL Server 2014
FIX: DBCC CHECKDB doesn't report metadata inconsistency of invalid filegroups in its summary in SQL Server 2014
FIX: It takes a longer time than earlier versions of SQL Server when you run DBCC CHECKDB in SQL Server 2012