Maybe. WiC reader Keith took the below photo a few weeks ago while on a bus tour of Belfast during a vacation to Northern Ireland. The tour guide told them there were two projects currently in production at the Paint Hall and that this set was for HBO’s Game of Thrones.
Winter Is Coming: I don’t know if I believe this tour guide who claims this set is for Game of Thrones. It seems a bit early to have set construction occurring on Thrones. Since this pic was taken a few weeks ago it seems much more likely that this set is going to be used for Your Highness (which began filming this week and is slated to last for 12 weeks). However, with Highness wrapping so close to when Thrones is scheduled to start filming there has been speculation that HBO may reuse some of their sets. So it is possible this set is being built for Your Highness, but may be used for the pilot as well. I can see it being the entrance to Winterfell’s Great Hall.
UPDATE: According to Adam Whitehead, this set is for Your Highness. It was shown on BBC Northern Ireland during a feature regarding the film.