I was in the SQ Gold lounge last week. It's shared with the Mahraba lounge - well, it basically IS the Mahraba lounge with an additional entrance really. I think it's pretty good hold-over until the new lounge, certainly many times better than the old SQ Gold which was dire. Reasonable bain-marie selections, beer fridge and some spirits, seating with power points etc. I wouldn't want to spend 3 hours there but I think it's ok.
One new experience: getting a buzzer unit to advise you of when a toilet becomes available. Yes, toilet space is limited.