Any plans to allow Predicate and Expressions in the query language?

[mps]

Any plans to allow something like this?

var linq = new List<Predicate> { c => c.OwnerId== criteria.OwnerId, };

        if (criteria.Status.HasValue)
            linq.Add(c => c.StatusCd == criteria.Status.Value);
        if (!string.IsNullOrEmpty(criteria.Source))
            linq.Add(c => c.Source == criteria.Source);
        Expression<Func<Client, bool>> where = p => linq.All(pred => pred(p));
        return Session.All<Client>().Where(where).OrderByDescending(c => c.ModifiedDt).ToList();