default modifiers for 7.2b4

has the default clause been changed for 7.2b4 so as not use a statement as such:

create table news(
id serial,
date date DEFAULT 'select now()::date' NOT NULL,
topic varchar(256),
body text
);

the above query results in ERROR: Bad date external representation 'select now()::date', yet if I use this on a production 7.1.2 machine it works fine.

Mike