The popup you get if you click the little symbol in the bottom right corner of your screen states that if you pre-purchase you will gain the Ambassador title, but the title you actually receive is Elonian Envoy. Nothing wrong with the Envoy but might wanna fix it asap. 
Wrong title in PoF info...
Nice to know I didn’t miss out on something here. I logged in the night of Aug. 1 and received that pop-up, but was unable to make the purchase until the next day. I made my pre-purchase around 5 pm EST Aug 2nd.
The way I read that pop-up was that if we bought the expansion on the very first day of announcement and only that day, we’d get an “Ambassador” title in addition to whatever the other perks were for pre-order. That apparently was not the case.