The wait is over! Finally the official release of HEC-RAS Version 5.0 is here. You can download it from the HEC website at http://www.hec.usace.army.mil/software/hec-ras/
If the download from the HEC website is slow, you can also download it from here:
https://drive.google.com/file/d/0B0bpiyLiUeRXTy1pdUNralMzZ1U/view?usp=sharing (207 MB, Installation package without example problems)
https://drive.google.com/file/d/0B0bpiyLiUeRXNGllMlE5V1dmQmM/view?usp=sharing (538 MB, Installation package with example problems)
This new version also comes with updated manuals (User's Manual, Hydraulic Reference Manual, and Applications Guide), as well as a new 2D Modeling Manual.
Enjoy and good luck!!!