Yes it is Gil Hanse. The work involves three parts: removing some bunkers and adding new ones, redoing existing bunkers, and some tree removal. About 6 holes are done or in process so far (work started after Labor Day) and early reviews are positive. One exciting aspect of Gil's work is he's reviewed the plans that William Flynn did for the club back in the 1920s when Flynn was asked to prepare and propose a course redesign for the club. The DCC board rejected Flynn's plans, reportedly on the grounds that the Flynn course would be too difficult. I have the Flynn plans and the DCC board was probably correct in its assessment--but what a course it would have been, with Pine Valley-like waste areas and challenging bunkering. Gil Hanse has incorporated some of the Flynn concepts in his bunker work, including locating some of the bunkering on the par 5 8th hole consistent with Flynn's plans. Hanse also is using a scale of bunkering that is striking, with some bunkers stretching between the fairways of two adjoining holes or, in the case of the adjacent 10th and 16th greens, connecting the greenside bunkers with one large bunker. Although there was nothing significantly wrong with the previous bunkering other than the inconsistent quality of the sand (which some of us on this site may say is good!), Hanse's work will improve the course, requiring the golfer to think more off the tee. And tree removal is almost always a good thing IMO (don't forward this post to the DCC tree committee please...).
Pete, actually, Will Nicholson has had more influence at Augusta National than at Denver CC.
Ben, I'm not sure what confined areas/holes you're referring to. Happy to add color if you have questions.