Yep. Per his Twitter...
@matthewmercer: With today's release of @Obsidian's #PillarsofEternity, I'm excited to announce I voice Edér & Aloth, as well as misc others. Enjoy, folks!
I thought even read that somewhere that he was the voice for both Aloth and Eder.
If that's way off base, I'll blame the error on sleep deprivation due to self induced play throughs of Etermity.
*Edit --missed RedSocialKnight's post.
They were discussing the possibility of opening up an Obsidian store.
Don't know how far those talks got but I myself would be interested in getting an Obsidian water bottle *hint hint.*
If you backed Pillars of Eternity, they were selling Obsidian tshirts as an add on.
I don't see why they wouldn't keep the same editions on the marketplace.
If you do wait a while though, you'll probably see the price come down or hit a sale on steam or gog.