We were just on the Connie in June. Nothing was said beforehand about tips. Onboard we were given a slip to return to the desk. You could tip the standard amount, and you could add more if you wished for specific people. When you turned in the slip you were given vouchers to put in the envelopes so you could personally shake hands and express your thanks. The tips themselves, of course went on the shipboard account. If you really wanted to, you could use cash as before.
We thought this was the best of all worlds: no need to screw around with cash, but there was still the opportunity to reward as desired, and to "present" the tip in person.