These are interesting, and I dont have any more information regarding them at this point, but this rumor points to models for several different armies. Chaos Marines, Chaos, Eldar, Space Marines, and Orks all have something in this bit.
Please remember that these are rumors.
via the birds in the trees 1-20-2015 from a 40k related FB group
A new bio-mechanical construct (like the Maulerfiend)
Larger than the Helbrute. One arm: Large chain with scythe-end in one hand, other arm is long barreled vulkan cannon, walker (two mechanical legs)
CSM fast jet, similar to the Forgeworld flyers. CSM pilot, quad missiles underslung, ventral vertical stabilizer.
New plastic infantry spotted in two styles,
One armed with chainswords (Striking Scorpions possible)
One armed with halberds (Incubi possible)
New surface vehicle. Light, fast wheeled vehicle. Opentopped with side by side driver/gunner positions.
SQUIGS, SQUIGS SQUIGS! with bombs and other gubbins...
In various stages of development, time to market unknown.