All these posts lead to a drop during an event.
Interesting is all the images are from artefacts in exhibition in the British Museum.
The image shows the god Nisroch
Using a columnar transposition on the message above using jigmrnqdshkpfoclawtuebv as the key (a.k.a. putting in as the first row and then ordering it in alphabetic order ) you get the following message
high yield xm inventory package at anomaly site niantic labs leader ready for handoff obtain secure code phrase then approach cautiously eom
The image is of the Shabaka stone
These are the coordinates of Amsterdam (52.37° N, 4.89° E)
The image is that of a Lamassu
April 12 : 2014
This is a hint to the G+ page https://plus.google.com/u/0/106327138010385230607 that ends up being John Hanke's profile
The image is of Ashurnasirpal II
Strangely this post was made not by VI but by John Hanke
The image is from The Royal Lion Hunt.