Is Clint Eastwood the Mystery RNC Speaker?

Is Clint Eastwood the Mystery RNC Speaker? (ABC News)

• The biggest Oscar scandals
• Tribeca Film Festival still growing

Is Clint Eastwood the Mystery RNC Speaker? - There's a big mystery in Tampa. Who is the "TBA" who will address the convention Thursday night just before Marco Rubio and Mitt Romney?

• Top 10 Oscars moments
• Is that really your best angle? Irina Shayk's metallic gown is a little too revealing at the Vanity Fair Oscar party

It's a prime slot on the final night of the convention. The convention hall has been buzzing with the possibility - almost the expectation at this point - that it will be Clint Eastwood, who endorsed Romney earlier this year.

You'll recall that some Republicans were frustrated by Eastwood's appearance in that Chrysler Super Bowl ad about "halftime" in America. Romney, of course, opposed the auto bailout that saved Chrysler.

I talked with Diane Sawyer about the Eastwood question on "World News." Take a look after this piece by Jon Karl ( ABC News )

• Nicole Kidman Remembers Attending The Oscars With Tom Cruise
• 'Oscar Curse' Study: Researcher Weighs In
• Mo'Nique was rude to Barbara Walters during ABC's Oscar special after 'View' slight: source
• Barbara Walters: Final Oscars Special Is Best