wondering when this will be implemented.

[Valmar]

As far as selling goes, you can Craft a Summoning Bell for your House. No Further infomation about a Market Board for your house has been released.

[DudeImAlive]

I didnt mean selling from your fc house as in using your retainers to put things on the market board. From what I understood there would be a vendor or board selling your items for you from the fc house. I know that seems odd but i actually meet up with other players at their FC houses if I know they specialize in a certain field. I was made aware of them through LS chats or friended them when someone answered my party finder request for such assistance. I wouldnt be surprised to see stores advertised through Party finder like that. I wouldnt mind just sight seeing in another free company and making a purchase at their store to show them my support as well. I think a device like that would be beneficial to the community to help encourage exploring your neighboring FC houses although I can see why it wouldn't be for everyone.