I’m in the same boat, owner of Model s and reserved 2/5/18, Standard battery changed to "Early 2019". First production and dual motor are still "Late 2018".
It will be interesting to see some of the people who reserved on day 1 chime in if their estimates get revised to push out the standard battery. I suspect there will be a lot of anger if they push it out in a way that prevents people from getting the full tax credit.