The run-up to the hearings has brought no surprises or revelations which would derail the nomination, and even the expected Republican opposition has been rather muted.
It certainly appears that Kagan's ascension to the Court would not change voting patterns among the Justices, and if she votes as retiring Justice Stevens voted this year, the outcome of cases would be the same. I suspect the real fight will come when a vacancy among the conservative members of the Court arises, because replacing a conservative with a more liberal vote will change the direction of the Court.
Documentary material related to the nomination has been posted by the Judiciary Committee. It is available here.