Thanks for posting this thread, now I know that 3.0 is no longer in alpha/beta
Linked at the bottom of the screen is one of the updated docs for running opencv in eclipse.
http://docs.opencv.org/master/d7/d16...html#gsc.tab=0
EDIT: Be sure to get yourself a working C++ environment before you do the OpenCV stuff. It will make a lot of the unix specific stuff be abstracted out since you have covered yourself by ensuring it works on windows already (like compiler selection, and setting the PATH variables...).
As for "installing" on windows, the procedure is to run the self extracting binary (from their sourceforge page) and adding the [extracted_directory]\bin to your PATH environment variable. You can choose to do it for your system (set and forget, but long lecture about polluting the PATH variable) or you can set this directory to be referenced in your eclipse project, as referenced in the above tutorial. Unless you want to build your own binaries, most of the windows tutorials is just the first paragraph and the "setting up the environment" last quip with the PATH.
OpenCV is great, I have used it for my senior project in college. Once you cross the install hurdle, you are pretty much set. Good luck out there!