There is a discussion running at EuroBricks because someone reported to have found in a new set, two different types from part 3711 (TECHNIC Link Chain).
As visible from the pictures below the new design (topside) seems to have got some more plastic and thus been reinforced.
This particularly visible in the gap reduction at consecutive chain elements linkage. Although part characteristic dimensions and elements spacing, remains unchanged.
As a matter of coincidence, at the same time Mauricio from iLe9os wrote me to report the exact same situation.
In his picture bellow we may easily compare the differences between the old and the new molds, in a side-by-side photo.
Not that I'm aware of many reports about these parts to break in service (specially if we realize at some applications like some pneumatic engines using these parts and reaching thousands RPM) but it looks that effectively TLG has come with a redesign for this part.
Maybe this small modification turns also the production process more reliable and thus cheaper!?
So it won't be because of the Link Chains, that guys at LPE Power won't be able to push even further, some of their motors.
Meanwhile it seems customers have some probability two find both types mixed, whenever they open a new box. At least until TLG manages to exhaust all the old parts from their stocks.