I am always impressed with Xero about how they invest in the product and continually add updates that improve the user experience and make the bookkeeping easier. For this reason, they do regularly review their prices ...
If you are in a discount period when the price rise comes in, with a percentage discount, this will continue to be honoured on the new rate for the time originally agreed. If you have one of the plans with me which does not allow for raising invoices or bills, the ledger or the cashbook plans, they are staying the same price.
So, do look out for the changes on your invoices and if you have a standing order set up to pay this will need to be updated from September onwards.
If anything I've written here resonates with you, call me on 01604 420057 and let's see how we can help you.