As stated before, news and rumours isn't for questions. If you want to see what the current
40k rumours are keep an eye on this section or alternatively you can wade through this.
http://www.dakkadakka.com/dakkaforum/posts/list/448304.page
There are currently no Plastic Plague marine kits either released or in development as far as rumours go.
The closest you get at the moment, are the finecast recast of the metal conversion kit and the Forge World resin conversion kit.