There are now some things we might not be seeing for awhile, however we are still supposed to be seeing models released in June.
It seems that the Voidraven is pushed back. I have heard vagues about them not being ready, and needing to be pushed back. Others we will not be seeing were originally going to be metal models. Since GW is apparently not going to be producing metal models, it seems that our Wracks, Haemonculi, and Grotesques are pushed back some.
Remember that these and the following are rumors, and are subject to being changed, misinformed, and otherwise wrong. Please take with salt.
Wracks/Grotesques/Haemonculi are almost certainly NOT happening in June (99% sure on this one).
new info regarding june: apparently the voidraven isn't coming. only the razorwing is.
I've had 2 sources contradict each other now, so not 100% sure what to believe, but I'm more inclined to trust that it isn't going to be released in june.