As with all things, it is subject to change without notice.
One year I was on the Grand Plan and staying in a two-bedroom suite at the Grand Floridian Resort. There was NO concierge service with the suite. The next time I stayed at the Grand Floridian in a two-bedroom suite, I was not on the Grand Plan and yet concierge service WAS included. So, as you can see, everything is subject to change without prior notice.
If you want concierge service with a suite, make sure you book it that way and get it in writing. Lately, it appears that most suites do include concierge service; however, I would hate for you to count on that level of service and then have your vacation experience lessened because the rules changed at the last minute and you did not receive what you thought you were going to receive.