Blue Lake last weekend was great. Lots of small flows with some sections of good ice and other areas with rather thin cover (note that as it was my first time there I have no reference for what normal conditions are).
Found one pitch with nice leadable ice going at around WI2. Everything else was toprop - easy to set up top anchors with a combinations of rock gear and stakes. Snow at the time was deep in wind loaded areas but not very compressible so made moving around tough sometimes. Access from Guthega was good. Lake appeared to be frozen over but we weren't game to test that..!