I have just looked on MacRumours and found out that Apple have stopped support for installing Windows 7 with BootCamp on the 2015 MacBooks (Air and Pro) (link). Since I am going to get the new 12" MacBook I am guessing that too doesn't support Windows 7 using bootcamp.
Since Apple are stopping the drivers for the 2015 models as well, is there still a way to install Windows 7 on the 2015 versions of the MacBook? (I sometimes need Windows 7 on my Mac for college)
Edit
Thank you for the replies.
I ended up getting the MacBook Pro since they didn't have any MacBooks in store. Since I have the MacBook Pro I can now run Windows 7 in a virtual machine (as suggested by you) because I do not have heat and performance issues.
Best Answer
You can install unsupported operating systems such as Linux or older Windows versions by not using the bootcamp assistant.
Open disk utility and create a partition, format it FAT. Then reboot whole holding alt/option and boot from the install-disc (CD, DVD, USB drive, ...) and install as usual.
Now comes the tricky part. Since the OS is not officially supported by Apple your on your own regarding driver-install. You'll be able to just use the regular drivers from the vendors for things like audio and wifi, for apple specific drivers, you can use the drivers that are downloadable by boot camp assistant. They single drivers are usually easily accessible in the package, you just can't use the Install-Everything App that Apple bundles with them.
Alternatively, use virtualization is a good option.