Here are a couple pics of Siyeh from my hike over Siyeh pass on the 18th. Looks like the standard route is mostly clear. The route is to the right of the longest snowpatch. There were lots of ducks and cairns marking the route when I did last fall, but who knows what changes winter has brought.
I like the Cracker Pk route, but personally I would wait till more snow melts off. Edit- EarMountain is correct, last time I took that route I encountered 3 Australians coming down. They turned around at the cliffs.
I have no experience with the Cataract route.
Wish I had the time, I'd love to join you. Hope you have a great trip.