Model S to be delivered in 1 week. Advice

So I have received confirmation of delivery for a Model S. But Im also hearing that a "refreshed" version might be available in a few months. I totally realize that with any tech its constantly changing, but would like to be correct for at least awhile. ie would you purchase a new phone knowing a new one is being released in a few months. Obv. other factors to be considered, one being how much do I need a car now and to answer that I dont. There is really no urgency in this.