noformerka, when you lease, payments change little through the year, and as the model year marches on if they do change they usually do so to the benfit of the consumer.
The interest rate in April or May will likely be lower than it is now, but the residual value will also drop, and the changes usually wash themselves out in the final payment. The lower residual/rate scenario is advantageous to the consumer even if the the payment stays the same if you intend to purchase the vehicle at lease end, the amount of course will be less than now. If you have no intention of keeping it, it makes no difference.
Come May however, selection for options and colour may be more restrictive than today, and the dealer may not offer the generous discount.