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Telescopes to be launched over the next decade-and-a-half, such as JWST,EUCLID, ATHENA and Lynx, promise to revolutionise the study of the highredshift Universe and greatly advance our understanding of the early stages ofgalaxy formation. We use a model that follows the evolution of the masses andspins of supermassive black holes (SMBHs) within a semi-analytic model ofgalaxy formation to make predictions for the Active Galactic Nucleus (AGN)luminosity function at $z\geq7$ in the broadband filters of JWST and EUCLID atnear-infrared wavelengths, and ATHENA and Lynx at X-ray energies. Thepredictions of our model are relatively insensitive to the choice of seed blackhole mass, except at the lowest luminosities($L_{\mathrm{bol}}<10^{43}\mathrm{ergs^{-1}}$) and the highest redshifts($z>10$). We predict that surveys with these different telescopes will selectsomewhat different samples of SMBHs, with EUCLID unveiling the most massive,highest accretion rate SMBHs, Lynx the least massive, lowest accretion rateSMBHs, and JWST and ATHENA covering objects inbetween. At $z=7$, we predictthat typical detectable SMBHs will have masses,$M_{\mathrm{BH}}\sim10^{5-8}M_{\odot}$, and Eddington normalised mass accretionrates, $\dot{M}/\dot{M}_{\mathrm{Edd}}\sim0.6-2$. The SMBHs will be hosted bygalaxies of stellar mass $M_{\star}\sim10^{8-10}M_{\odot}$, and dark matterhaloes of mass $M_{\mathrm{halo}}\sim10^{11-12}M_{\odot}$. We predict that thedetectable SMBHs at $z=10$ will have slightly smaller black holes, accreting atslightly higher Eddington normalised mass accretion rates, in slightly lowermass host galaxies compared to those at $z=7$, and reside in haloes of mass$M_{\mathrm{halo}}\sim10^{10-11}M_{\odot}$.

AGNs at the cosmic dawn: predictions for future surveys from a $\Lambda$CDM cosmological model