Why don't you contact the GM of the hotel, wishing him well with the changes, reminding him of the promised benefits; explaining that you would like to maintain your loyalty to the property and ask him how he will respect the promises already made in the light of the change in affiliation.

He may offer the same or some alternative, might even better it as they may be contemplating a drop of business due to the change and may want to particularly target loyalty retention. But knowing means no suprises and offers you the chance to plan and I see no downside with asking.