Another new gun on display at DSEi was this H&K HK416 sub-carbine / PDW. What is very interesting about this gun is the buttstock and upper receiver design.
It has a much shortened buffer tube and a collapsible stock in the H&K G3 / MP5 style.
This firearm appears to be positioned in direct competition to the Sub-Compact Weapon (SCW) that Colt is developing. The SCW features a similarly shortened buffer tube.

I think the H&K design is much more elegant. The H&K stock pull straight out, while the Colt stock must be unfolded out and then down before it can be adjusted for length.
Now if H&K would just stop hating us and start selling this nifty upper to us civilians!
Big thank you to Lusaka for the information and photo.
UPDATE:
REMOV has kindly provided me with these photos that he took of the new H&K. The gun has a 9.3″ barrel.
Many thanks REMOV!