Well I'll reply myself for anyone who cares:
DJI Mavic PRO FLY MORE COMBO Portable Collapsible Mini Drone-Newegg.com (click "questions/etc..')
According to poster there DJI confirmed that all newegg orders displaying 18th october are part of the first batch. Newegg orders are now second batch (25th october).
Thus this seems like it was legit and a good way to get in the first batch (while amazon/dji already had filled their first-batch reserved slots). Woot. 25th october is still pretty decent compared to other vendors who also filled their 2nd batch and will delivery in november, in fact.