From Time's Michael Scherer's preview of Huckabee's upcoming tell-all book:

Mitt Romney, Huckabee's principal rival in Iowa, comes in for the roughest treatment. Huckabee writes that the former Massachusetts governor's record was "anything but conservative until he changed the light bulbs in his chandelier in time to run for president." ...

His treatment of former candidate Fred Thompson, a rival who helped sink Huckabee's upstart ambitions in South Carolina, is somewhat more favorable, if only because it is less personal. Huckabee maintains that Thompson's biggest mistake was strategic: he didn't understand the need to expand the Republican Party beyond its base. "Fred Thompson never did grasp the dynamics of the race or the country, and his amazingly lackluster campaign reflected just how disconnected he was with the people, despite the anticipation and expectation that greeted his candidacy," Huckabee writes....

In a chapter titled "Faux-Cons: Worse than Liberalism," Huckabee identifies what he calls the "real threat" to the Republican Party: "libertarianism masked as conservatism." He is not so much concerned with the libertarian candidate Ron Paul's Republican supporters as he is with a strain of mainstream fiscal conservative thought that demands ideological purity, seeing any tax increase as apostasy and leaving little room for government-driven solutions to people's problems. "I don't take issue with what they believe, but the smugness with which they believe it," writes Huckabee, who raised some taxes as a governor and cut other deals with his state's Democratic legislature.

There's more, of course. Initial thoughts: The Huckabee and Romney feud has been going on since the start of the primaries, and considering who was last standing (or second-to-last), I think Huck won it. But it is the right time for Huckabee to be attacking? While the right has its issues with Romney,  it hasn't tried to purge him from their ranks. In other words, Romney's considered a valuable contribution to the Right's cause and hasn't made up its mind on whether he'll be the standard-bearer of that cause in four years.

Also, knocking Fred? Thompson's candidacy sputtered before it got started, but Fred, at least publicly, hasn't blamed anyone; if anything, he's been a faithful warrior for the Right, arguing a traditional "fusionist" message. Just seems like an odd target for someone known for his good-will.

UPDATE: Via Jonathan Martin, the Romney team has hit back with this statement from spokesman Eric Fehrnstrom:

"This type of pettiness is beneath Mike Huckabee,” Fehrnstrom. “If we're going to move the party forward, we need to offer more than personal recriminations. Unfortunately, in this book, Mike Huckabee is consumed with presumed slights, and he seems more interested in settling scores than in bringing people together."