Hard to imagine that President Obama will name his SCOTUS choice anytime soon (i.e., this week) unless he pre-decided and pre-vetted. Sources close to Judges Sonia Sotomayor and Professor Pamela Karlin, as well as solicitor general Elena Kagan, say that, as of Tuesday, none of them had received proffers from the White House. There are other candidates, surely... but if none of these three have begun to be vetted, this pick is still in its infancy.
A handful of senior Obama aides, including Valerie Jarrett and Michael Strautmanis, are working with Cassandra Butts from the White House counsel's office and with counsel Greg Craig; they're regularly consulting with Vice President's Chief of Staff, Ron Klain, who knows more about these judges and this process than anyone else in government. In fact, Klain is good friends with most of the most-mentioned names.