im assuming you are reffering to the june issue where it tests the 1098, 848, RC8 and RSV Factory??
i was just reading it and could not spot anything which suggests a different engine, except saying the older milles had lower power but supposedly more torque and less revs
i am pretty sure its still the rotax engine, but they did tweak it in a few ways with the 2004 update and i think there were a few minor changes with the 2006 update aswell.
i heard they are discontinuing the rsvr at the end of 2008 nooo
at least the v4 will be available then (i hope..) and then there really will be a different engine hehehe