They also did not say they would send dancing girls to your home every Thursday night...maybe they should have made this clear on the product page? It would be silly for them to create a list of what the product does not do.
What will I receive when I install the Windows 8.1> Media Center Pack?
The Windows 8.1 Media Center Pack adds Windows Media Center and DVD playback functionality to PCs running Windows 8.1 Pro.
Windows has never been able to play blurays. Had they added that ability, the EU would have immediately swept in on their favorite ATM (aka Microsoft) and stolen a ton of money from them via the EU's legal system, just like they did when MS added a free graphical web browser to Windows (and therefor kicked off the movement of the masses to the world wide web). With the EU being so money hungry and so hateful of MS, MS would have to have been completely stupid to add that feature. All that said, Win8 can read bluray discs used for data storage purposes. Now that you have WMC, you can play a DVD movie burned onto a bluray disc - just not a bluray movie on one.