Windows XP will not be available much after 30th June as that is the official end date both for the retail version and the OEM version pre-installed on machines. You may be lucky after that as it will be “while stocks last” and smaller independent system builders have until January to stop, but don’t cut it too fine if you must have one. Time to check if you have enough licences for your future needs.
Support will be available until April 2014 but I am sure that it will be a gradual wind down.