Shouldn't get to excited....Sketchup has been large address aware since version 8 to allow access to more than 4 meg of ram.
The main problem has always been that it only use's 1 cpu core, even if you have a quad core processor.Having said that, they have stated that they have made some improvements to the internal code and cleaned up some bugs so we should see a bit more speed out of the engine.
The other improvements are minimal and some of them can already be had with the current range of plugins anyway.
Sorry to put a downer on things !
CPU:-AMD 1055T 6 core, Motherboard:-Gigabyte 990FXA-UD3 AM3+, Gigabyte GTX 460-1GB, RAM:-8GB Kingston hyper X Genesis DDR3 1600Mhz D/Ch, Hard Disk:-500GB samsung F3 , OS:-Win7 64bit