Curious question about storage space in Win 8.1 Update 1.

So I updated my Asus Vivotab Note 8 with Update 1 and have a simple question. I installed it mainly because I read that minimum requirements of Win 8.1, Update 1 is down to 16 gig storage space. I concluded that if I install this update that some storage will magically become free in my device.

Clearly it is not the case. Did anybody else try it?

Also: Do you have space-saving tips and tricks so that I can save some space in the primary drive?