tt,
This is not a big deal and there is nothing to lie about. They will see all your scores (all your scores are listed on the official report), but only count the highest. Just say you are retaking your GMAT on September 30th and will foreward the new scores as soon as they are available, you do not need to make excuses or say anything more than that.
You should list the February score on that part of the application. Lots of people take it more than once and if you give them a specific date for retaking it they won't review your application until the new scores come in. While 560 is not in the 610-730 range it's not horrible and it looks good that you realize you can do better and are taking it again.
Don't lie and don't explain/make excuses, just list the facts.