I'm still assimilating little tidbits of information about the Nov-Dec CTP build. Put this one in your pubs database in the CTP:

create procedure deletejob (@id int)
as
begin try
 delete jobs where job_id = @id
end try
begin catch
 — you knew about these
 print error_number()
 print error_message()
 print error_severity()
 print error_state()
 — these are undoc'd but work in the CTP
 print error_line()           — line number
 print error_procedure()  — procedure name
end catch
go

execute deletejob 2
go