I actually believe the answer is yes, that it can support 40GE (via 4 x 10GE wavelengths) or be used with break-out cable. If you go to Pathfinder here - https://apps.juniper.net/hct/model/?component=QSFPP-4X10GE-LR&tab=sPlatforms and hover over the red "i" circles, the info appears to say that this transceiver can be used in either configuration.
The first question I might ask is, for which Platform are you planning to use this specific transceiver?