Seems all promos affected same way (i.e. no change to your rate). Someone posted as much about their retention offer.
The new customer offer wording is similar to the standard quarterly rate lottery style promotions:
5. "Additional Interest" is 1.50% for Applicable Accounts. Additional Interest is added to the Bank's applicable posted rate of interest listed on the Bank's website ("Posted Rate") to calculate the total amount of interest payable under this Offer. For example, Posted Rate of 0.80% on Tangerine Savings Accounts + Additional Interest of 1.60% = Offer rate of 2.40% (example uses interest rates current as of May 16, 2017). Eligible Clients receive Additional Interest on deposits to Applicable Accounts during the Offer Period. Interest is paid through two separate interest payments, one based on the Posted Rate and a second based on the Additional Interest. Any change to the Posted Rate will result in a corresponding change to the Offer rate. Additional Interest and/or Posted Rates may change at any time without prior notice."