Just looked it up: They are producing silicon on insulator (SOI) wafers and are offering customized epitaxy solutions, including GaAs and GaN. A possible scenario could be that a fab that wants to produce POET chips, but does not want to do the epitaxy itself, would instead buy "POET-enabled" wafers from Soitec.
Bottom line: no competition for POET Technologies, but could fit nicely into the Fab 2.0 scenario.