Null values support
Now null values are supported (for UPDATES only) in Linq
e.g.:
(from ent in table where ... select new TestTable() {... ck1=null }
(from ent in table where .... select new { ... ck1 = (int?)null }

They are supported in Context object too (for UPDATES only)

Inserts in Linq are threaded as a way to create the new entity, therefore it is assumed that if property has null value it do not results in <X>=NULL syntax in the final CQL query
UT for NULL support in Context