If Politics had nothing to do with the wild cards, my 4 would be Niels Kristian Iversen, Emil Sayfutdinov, Grigory Laguta and Martin Vaculik. However, not likely to happen so I would go with NKI, Martin Vaculik, Jarek Hampel and Peter Kildemand.
I definitely think they should announce it before the last GP and the riders below 8th would know what they have to do, unless of course they intend to wildcard them.