General Motors is “undertaking a strategic review” of its iconic Hummer brand, CEO Rick Wagoner said Tuesday, and is “considering all options … from a complete revamp of the product lineup to partial or complete sale of the brand.” As tempting as the sale of a widely vilified symbol of gas-guzzling excess sounds, analysts are skeptical of whether buyers will want to Hummer along. But GM’s change of tune isn’t temporary, says Wagoner: the company is making a wholesale shift to smaller cars. To further that goal, GM also plans to close four North American truck plants, and is on schedule to have the all-electric Chevy Volt in showrooms by 2010.