We don't know a lot about these at the moment, but they seem to be starting in Japan as potentially Gashapon figures. If so there will be questions over the quality of the plastic as these are generally cheap products sold through blind boxes or in vending machines.
Anyway, apart from that, we got our first good look at them today - and with paint on them they look pretty damn cool with dynamic poses and what looks like some very nice moulding.
It has also been confirmed from previous leaks that, yes, these will have scenic bases!
Although real information is very limited, there is an offical website www.spacemarineheroes.com
Thanks to Gobbla, I have had a bit more of a look around and found this shot (below) on Wargame News and Terrain which shows some (if not all) of these guys have alternate heads! Also on closer inspection, notice the Marine pointing the Bolt Pistol has an Umbra pattern Bolter. Added drool-factor!