Lightroom 3.3 release candidate can be downloaded from Adobe Labs page and supports the DP1x but they suffer from the same bad colors as Sigma Photo Pro 3.3 – strangely enough, it’s ONLY images with colors that reaches a very high amount of light and mostly affects yellowish tones
See the difference between Lightroom 3.3 release candidate and SPP 4.2

Photo by Linn Rytterfalk
Update: I just found another good example of when above is not true. :)

LR 3.3rc vs SPP 4.2, and I had to change SPP to neutral color mode to get similar highlights. Also I had to saturate the SPP picture quite a lot to match LR’s version some. It looked pretty pale in comparison but perhaps more real? Full size.
Let’s hope Adobe continues to work with the DP1x support and – well, same with Sigma. :)
