Hmmm... The 3 sister churches are usually late to the party so would be interesting to see if they'll allow it... However, as far as I know one of the big Dutch reform churches in Pta perform marriage for gay people, have a gay reverent and everything.
I actually wonder what my church's viewpoint is on the matter as I haven't heard anything on the subject yet. It is based on the same model as Hillsong United so I suppose it should be similar to their stance, but based on my time there, I think it is highly unlikely that anyone will be shown away.