I don't believe he's spoken publicly about the platform. I'm not much of a Dewhurst fan myself, but that is mostly personal experience. The guy's an opportunist, which means he often does the right things but for the wrong reasons.
I guage him as more conservative than Perry, at least in office. And I do have to give him credit as land commissioner - he was basically the only state officer in Texas during his term to actually restrain his office's budget. I disagreed with what he did on coastal erosion vs. property rights, but overall have to give him decent marks from his term as land commissioner. Compared to Perry's disastrous performance, that makes Dewhurst look wonderful.