Win 8
-use less memory
-bootup faster
-has better explorer
-is better with multiple CPU cores
Win7
-is out now
-is not too much weaker than win8
summasummarum
win8 is upgrade to win 7. Nothing too fansy, if not counting ARM support, but an upgrade in anyway.
So if you have win7, it is just fine to keep on using that, but if you are going to get new computer, it most propably is better alternative than win7. If the multicore CPU usage is much better, then those peoples who have 4 or more cores, should consider upgrade... But that remains to be seen. At least AMD is saying that win8 will remedy some problems that bulldoser CPU suffer, but not all. That allso remains to be seen, but tests with dev version seems to confirm that. It would be nice to see if 6 core Intel allso gets some benefits?