i am one of the lucky guys who already received an avrisp mkii. it works fine with avrstudio v4.12 (build 462).
but now i tried to program with stk500.exe and got the following error message:
Could not connect to STK500 V2 on USB
the command line looks like this:
stk500 -dATMEGA128 -cusb -ef -pf -vf -iftest.a90 -f0x021f -E0xfe