The new report can be found here. Not surprisingly, the report argues that Israel's practices in Area C (granted to Israeli civil and military control under Oslo accords) are discriminatory to Palestinians. Given the generally high visibility of this issue already, it's not clear what the value-added of the report is, but it's likely to spur a few editorials here and there.
UPDATE: The report contains an appendix of correspondence between HRW and the Mekorot water company. While the report contains all 10 pages of questions sent to Mekorot, and the Israeli government, Mekorot's response is not translated. It reads:
Re: Data for the Human Rights Watch Report
Your request was received by the Mekorot water company and referred for consideration to the appropriate professionals for response where possible.
Director, Reception Services