Just order it! I did, sure something new will come out after you’ve got yours but that’s life. There will always be a new, a better, stop punishing yourself and treat yourself to the Amazon MX that it is right now regardless of what the future will hold.
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I very much doubt it in the next couple of years, other than the usual detail updates Tesla typically make. Expect a new platform maybe around 2022 from typical automotive product lifecycles. Minor facelift perhaps 2020?
I dont see a design change. Tesla has invested all their money and time into refining the model 3 production line I highly doubt they have the time, capacity, or money to retool the model x production line for a brand new vehicle, especially since it took them so long to work out the problems with the first production run. I'm also eyeing to order mine in time for a Dec 2018 delivery. I suspect the $7500 federal rebate will phase out Q12019.
If you are going to order in 5 moths then check back in 5 months to see if there’s anything new or new rumors. While there’s nothing new at the moment it’s very possible something new will come out after you order OR even 1 day after you take delivery.