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If subpoenaed to testify, he will probably ask for and get Congressional immunity from prosecution for his testimony (and he will not be able to take the 5th). On top of that, he sees what Obama is doing to the country and the Army and is probably willing to tell the truth (as opposed to singing the WH line).

I would like nothing more than the secrets of Benghazi get exposed. But I will have to see what Petraeus actually does. Petraeus was not able to protect himself let alone those Americans stranded in Benghazi.

Petraeus didn't have the power to grant the Cross Border Authority needed to send (for example) jets or C-130 from Sigonella Naval Air Station (where they were standing on ready) into Libya.

Only the President can grant CBA...and if he doesn't, nothing can be done.

Here's another little tidbit about Congress granting immunity from prosecution to witness for their testimony (might be worth remembering, just in case.;-)...

Congressional committees have the power to grant testimonial immunity to witnesses who testify before members of Congress. Congressional investigations into allegations of misconduct—such as the Watergate investigations in the 1970s and the iran-contra investigations in the 1980s—rely heavily on witness testimony. Whereas prosecutors simply decide whether to grant immunity to a witness, congressional committees must follow more formal procedures. Immunity may be granted only after a two-thirds majority vote by members of the committee. Ten days before the immunized testimony is given, the committee must advise the Justice Department or the Independent Counsel of its intention to grant immunity.
Source: free (legal) dictionary