Kristy Deiner has contributed significantly to the eDNA literature over the past few years and is the lead author on an article that was published in Molecular Ecology in September 2017. Environmental DNA metabarcoding: Transforming how we survey animal and plant communities provides an excellent review of how eDNA metabarcoding is used to survey animal and plant species richness. It also details the various challenges involved with using metabarcoding to calculate abundance. This is an excellent overview of what can be accomplished with this technology and is a very accessible read. It touches on some of what we plan to explore and accomplish with the OBGP as we work to evolve these methods. I highly recommend checking it out if you have the time and—being that Kristy Deiner is a hero of mine—I'm always excited to see what she's been up to.
There's also a project up on ResearchGate that I'm currently following that has brought together a lot of the stars of the eDNA world. They're all involved with DNAqua-Net with the goal of identifying the best available genomic tools for biodiversity assessments and biomonitoring in aquatic systems in Europe. They've had several meetings over the past couple of years and I hope I can make it to the next one as a representative of OBGP.