Market Place Button appears to have been removed. Apparently there was a ninja patch (I did notice the installing bar for a moment when I logged in through the launcher). One player using a custom UI did report he still had access to the Market Place. While another could not access it with a custom UI. Most may not care but I figured I'd pass it along.
Hopefully we will be able to petition for items that we wanted to purchase from the marketplace now. I had a couple items I wanted to get for a GH. I would say I am surprised this was removed without any warning, but deplorable communication is the one thing that has remained a constant throughout VG existence.