The first galaxies and miniquasars will remain largely inaccessible to future 
telescopes, but may be detectable via their contribution to the Cosmic 
near-Infrared Background (CIB) anisotropies. A significant extragalactic 
clustering signal from an unresolved population is now well established 
by CIB fluctuation measurements. I will review the current status of the 
field, including a recent discovery of a cross-correlation signal between 
the CIB fluctuations and the unresolved Cosmic X-ray Background. I present 
a population study of all galaxies and AGN and predict their contributions 
to the CIB and CXB including the mutual cross-correlation signal. I discuss 
the signal's potential for probing the early Universe in several upcoming CIB 
measurements, including LIBRAE, a science program dedicated to CIB fluctuation 
exploration with the Euclid telescope.