I'm having the same debate right now. Mark Dodge told me 10-13 weeks on orders and I'll be doing a no money down transaction @ 0% interest. If you look at a financed amount of $ 65,000 over 54 months (I never do more than 54), you can use this calculator -
https://www.moneyunder30.com/auto-loan-calculator
My credit union is 2.49% interest rates today and could be higher in July so $65K over 54 months ends up being $3,777.10 in interest. So unless FCA does a $3500+ rebate in July when I supposedly would take delivery, the 0% interest is far more valuable to me.
Not saying it's not a good idea to hold off until May but I think I may lock in my order in March and then see if in July, the rebates are better.
Just saying my rational, everyone's situation is different.