People waited 6 years for the 5th gen to be unveiled and another 3 after that to actually be able to buy it. They'll be fine.
Yes we all want it now but expect to see it around June-July. Any sooner will just be a bonus. With any luck it will be on sale end of year or early next year which doesn't seem to far off when you consider the last gen mustang had a year before the Camaro went on sale and stole it's lunch money.